Tag: harlequin

Harlequin Tusk – Complete Care Guide
Harlequin Tusk Facts
Harlequin Tusk fish (Choerodon fasciatus) is a species of saltwater wrasse that can be found in the Indian Ocean and Australia. They are very similar in appearance in both regions however, the Australian Harlequin Tusk has more pronounced blue streaks running vertically throughout its body. This fish species always gets heads turning because of its eye-catching coloration. On top of the beautiful colors on this fish, it also sports blue pointy teeth that will make you think twice before putting your hand in the fish tank.
Choerodon fasciatus will be 10 inches when it is fully grown. You should also be very cautious if you plan on keeping this fish in a reef tank. This guide will discuss why and also how to care for Harlequin Tusks. If you know all about the Harlequin Tusks, consider checking out 5 Unique Predatory Fish for Saltwater Aquariums!
Aquarium Requirements
Because of how large Choerodon fasciatus becomes, it is recommended for fish tanks that are 125 gallons or larger. The aquarium itself should have plenty of rockwork that creates different sized caves for the Harlequin Tusk. Juveniles of this species are often very timid so it is great to provide hiding spaces.
Most saltwater fish have similar water parameter requirements. That is not any different with Harlequins. This fish does best under the following water parameters:
- Temperature: 72°-78° F
- DKH: 8-12
- pH: 8.1-8.4
- Salinity: 1.020-1.025 sg
From my experiences and research, it does not seem like Harlequin Tusks are known to be jumpers. However, a well-fitted lid is always recommended because you never know with fish.
Is the Harlequin Tusk Reef Safe?
These fish are cautiously kept in reef tanks, primarily because although they will not eat your coral, they will devour most invertebrates that are in the aquarium. However, they are often kept in Fish Only With Live Rock (FOWLR) aquariums.
Food and Diet
The Harlequin Tusk fish is strictly a carnivorous fish. They hunt and prey on small invertebrates such as snails, crabs, shrimp, and more in the wild. Their diet should replicate something similar to what they would eat in the wild. When they are small, they can be fed an assortment of Mysis Shrimp, Brine Shrimp, and Krill. Once they are older, Mysis Shrimp and Brine Shrimp may not sustain a hungry Harlequin Tusk. I would recommend feeding it larger meaty foods such as Krill, Clam on a Half shell, and squid. They may also eat large pellets and flake food. Most invertebrates are not safe with this fish in the aquarium. Harlequin Tusks and Cleaner Shrimp are not even a safe combination.

Do Harlequin Tusk Eat Aptasia
There is very little information on whether Harlequin Tusks eat aptasia. I can safely assume that they will not eat aptasia because they will not mess with coral or anemones in a reef tank. If anyone has any concrete information on this, please share! If you need to remove aptasia, consider purchasing peppermint shrimp but beware because they may destroy other coral.
Do Harlequin Tusk Eat Bristleworms?
Being invertebrates and Harlequin Tusks being wrasses, I can assume that this fish species will eat bristleworms. Perhaps not as well as a Sixline Wrasse or Arrow Crab, but Harlequin Tusks should eat some bristleworms when the opportunity arises. However, I do not have concrete evidence to prove this.
Do Harlequin Tusk Eat Clams?
Most of the searching I have done assumes that Harlequin Tusks do not eat clams. Being the rowdy carnivores that they are, I would still be a little cautious owning clams and Harlequins.
Tank Mates
The Harlequin Tusk has a reputation for starting life as a small timid fish, but it becomes more aggressive once it settles into a fish tank and grows. Choerodon fasciatus should be kept with fish that grow larger and can hold their own. I would recommend fish such as Triggerfish, Surgeonfish/tangs, Lionfish, large Angelfish, and Groupers. Smaller fish such as Chromis, Clownfish, Firefish, and many others are commonly eaten by Harlequin Tusks. Also, there may be increased aggression and fighting towards other wrasses.
Can you Keep More Than One Harlequin Tusk?
The simple answer is no. Harlequin Tusks become incredibly territorial and aggressive when they are grown and will fight others of their species. They wreak havoc on other fish and wrasses of different species, so it’s a bad idea to consider adding two Choerodon fasciatus together. Our aquariums are not large enough to comfortably keep more than one in a system.
Breeding
Breeding is not really possible with this species in an aquarium setting. They are incredibly territorial and will fight their own species. Also, it’s incredibly hard and/or impossible to determine whether saltwater fish are males or females.
Final Notes
Harlequin Tusks are probably one of the most beautiful saltwater fish available. If you can look passed their temperament (and their cost) I would highly recommend them if you have the correct setup. If you’re not ready to pick up a Harlequin Tusk, check out some other fish that are great for 30 Gallon Aquariums.
April 7, 2022
5 Fantastic Freshwater Fish for 10 Gallon Aquarium
Setting up a fish tank is a very fun and rewarding process. Making it your own work of art is definitely a long term endeavor. Deciding what fish to introduce into your aquarium is part of the process and probably the most exciting part of it all. This guide will help showcase some of the many freshwater fish that can happily reside in a 10 gallon aquarium. If you haven’t already setup a freshwater aquarium, check out this guide.
Harlequin Rasbora
To begin, I would like to introduce you to the harlequin rasbora, sometimes known as the t-bone rasbora. This rasbora has the iconic black pork chop shape displaying from the middle to the back of its body. Besides that, it has a beautiful copper/red toned body that stands out in an aquarium.
This fish is small and will be around 2″ in size when it is fully grown. Due to its schooling habits, it is recommended to have around 8 – 10 beautiful rasboras in an aquarium together. They normally do a great job closely schooling together and will fill the middle to top of your aquarium with life!
Image by Juan R. Lascorz on Wikimedia
Male and females can be distinguished from one another by observing the bottom part of their “pork chop” pattern. The males will have a straight tip at the bottom and females will have a more rounded tip. Females will also be a little bit larger than the males. These fish will successfully breed inside of a well planted aquarium. They require broad leaved plants in order to do so. Plants like the Anubias are excellent option to have in the aquarium. If one or many are available, the rasbora will potentially lay eggs on the underside of the broad leaf.
This species of fish are omnivorous. Providing a nicely ranged diet of pellet, flake, and frozen meat foods will keep this fish happy. They enjoy temperatures ranging from 72 – 78 degrees Fahrenheit, KH levels around 6 – 10, and pH levels in between 6.0 and 6.5. These fish are excellent choices for heavily planted aquariums.
Threadfin Rainbowfish
Threadfin Rainbowfish may not be as common as the harlequin rasbora but regardless it is an interesting fish to add into a freshwater 10 gallon aquarium. Their colors aren’t as vibrant as fish like the neon tetra but they can get a beautiful blue, gray, red, and black coloration on them. Males will have long threadlike appendages that reach out from their anal and dorsal fins. If you think their colors are lacking, the fins and shape surely make up for it.
Image by Gianmaria Visconti on Wikimedia
This fish species maxes at 2″ in size and are perfect for a planted aquarium 10 gallons or larger. They enjoy being in schools and I would recommend 5 to 8 individuals in a 10 gallon aquarium. 5 in an aquarium that is fairly open without too many decorations and 8 in a heavily planted aquarium.
Like stated before the males will have the long threadlike appendages protruding out of their dorsal and anal fins. The females will not. This is the easiest way to distinguish the two. Also, males will most likely be far more vibrant in color compared to the females. These fish have the possibility of laying eggs in an aquarium.
Threadfin rainbows are omnivorous creatures and benefit from having a large range of food. Due to their small mouth sizes it is recommended to feed them smaller pellets and meaty food. Flake food will work as well! This species of fish do well in water temperatures ranging 72 – 78 degrees Fahrenheit, KH levels between 7 and 10 and pH levels between 6.0 – 7.2.
Male Betta Fish
Male betta fish are very common fish in the freshwater aquarium hobby. They are often kept in large bowls without filtration due to their ability to acquire their own oxygen. They can and should be kept in larger aquariums than a bowl to keep them even happier. The betta fish has a fantastic personality and interacts well with humans. You can’t take it out and play with it but they know when it’s dinner time and will swim up to the glass to greet you. They have many different colors and a wide variation in fin shapes. I will be broadly providing information about bettas here.
Most betta species reach a max size of 2.5 inches. There may be a little variation dependent on their fin lengths. They should be the only betta kept in an enclosure. They may be kept with other fish but be sure the others will not nip at the betta’s fins and because the betta could nip at fish with long fins as well. Female bettas can be kept in an aquarium together but they do not have as pronounced fins.
Males and females should only be housed temporarily if they are breeding. The male will build a bubble nest and the female will lay her eggs in it. Once that occurs, the female should be removed. The male will tend to the eggs until they hatch. Once hatched very small food should be given to the newly hatched fry. Foods such as baby brine shrimp and crushed flakes should be provided.
Betta fish are carnivorous fish. Their diets should consist mostly of protein rich foods such as bloodworms, brine shrimp, or protein heavy pellet food. Due to their diets the aquarium might see spikes in undesirable water parameters so testing the water should be a common occurrence. The betta fish also thrives in water temperatures between 75 and 80 degrees Fahrenheit, KH between 0 and 25, and pH levels ranging from 6.0 – 8.0.
Endler’s Livebearers
Endler’s Livebearers continue to gain traction and popularity in the freshwater aquarium keeping hobby. Their vibrant assortment of colors make them a wonderful addition to any aquarium. They are fantastic to add if you are looking for lively fish for the middle to top of the aquarium.
Image by Usien on Wikimedia
These fish normally start off very small, usually purchased when they are less than an inch in length. They will grow to be roughly 2 inches in sizes when they are fully grown. Keeping around 6 – 8 in a 10 gallon fish tank is suitable with the understanding that this species of fish breeds like no tomorrow and 6 fish can easily turn into 20 then 50 and so on. Proper housing for the new offspring will be required.
Endler’s livebearers are as their name suggests, live bearers. They do not lay eggs but instead their offspring come out of their womb very well and alive. Treat them like any other platy, guppy, or swordtail when for breeding purposes. They do not require anything special.
This species of fish is omnivorous and would love a nice variety of foods. Like stated above, pellet, flake, and frozen meat foods will provide all the variety this fish needs to obtain its nutrients. Keep in mind they are usually sold very small so flake food might need to be crushed a little for them to enjoy it. They do best in water temperatures ranging from 75 – 80 degrees, KH levels ranging between 10 and 30, and pH levels with a wide range of 5.5 – 8.0.
Cardinal Tetra
Last but not least on this guide is the beautiful cardinal tetra. Do not mistaken this fish with the neon tetra. They look incredibly similar but the cardinal tetra’s red stripe runs from its eyes to tail and it lacks that white area near its stomach. This fish is more for expert fish keepers because they’re a little more finicky than other fish.
Image by Elma on Wikimedia
When they are full grown, cardinal tetras reach a size of 2 inches. They are perfect for densely planted aquariums of 10 gallons or larger. I would keep a school of 6 to 8 cardinal tetras in a 10 gallon aquarium. They are quite an active little fish and their vibrant colors add to their beauty.
It is possible to breed cardinal tetras in an aquarium but it is not very common. They require very specific water parameters to successfully breed. Specifically dH levels between 1 and 2 and pH levels as low as 5 and 6.
Just like many of the other fish in this list, cardinal tetras are omnivores and benefit from a range of food. Starting off with flake food is a good idea until this fish is able to consume larger pellets. Brine shrimp is always recommended as well as bloodworms! This is a fantastic fish with colors that can drop jaws!
Final Thoughts
This is just a small list of fish that will do well in 10 gallon aquariums. I wanted to choose fish with vibrant colors or very unique fin shapes and designs. Hopefully this list helps provide information needed to help choose some cool freshwater fish for 10 gallon fish tanks. If you already have the fish, check out information on low light freshwater plants you can add to your fish tank!
September 2, 2020