As we know Oscar fish are original from South America and they are also one of cichlid family. As my previous post mention before, Oscar fish do have an amazing growth ability which their can reach it maximum size in 3 to 4 year times. Keeping Oscar fish in the aquarium only would be boring but what if you mix them with different freshwater fish, it would be fun and choosing the right Oscar fish tank mates would put you a challenges.

Oscar are known as one of the aggressive freshwater fish which it is important to choose the suitable tank mates to mix them in the aquarium. Keeping a pair of Oscar fish in the aquarium, you get a 55 gallon aquarium which are enough for the fish to swim around. Always provide a lot of hiding spot for the fish to prevent the fish act aggressive and territorial behavior.

Mixing the fish together with other type of freshwater fish, it is better mixing them in a 100 gallon aquarium. Most of the aquarist do recommend mix Oscar fish with a similar size of fish. It is true Oscar fish will consume smaller size fish as food but certain smaller size of fish also compatible to be Oscar fish tank mates. Here are the compatible fish which suitable to mix together with Oscar fish.

Oscar Fish Tank Mates

Here are the list of Oscar fish tank mates you can consider:

Firemouth Cichlid

Firemouth Cichlid

Firemouth Cichlid

This one of the fish are smaller than Oscar and also make a great tank mates too. The fish will reach 15 cm in it full growth. The advantage about this fish are they are good in avoiding conflict which makes a great tank mates with Oscar fish.

The fish will flee from Oscar fish rather than fighting. It is recommend to provide hiding spot for the firemouth cichlid. Prepare rocks or caves which the fish can hide from Oscar fish. The fish are easy to care and they can live comfortable in the temperature of 25-28°C which are the same with Oscar fish.

Black Convict Cichlid

Black Convict Cichlid

Black Convict Cichlid

The black convict cichlid would make a great Oscar fish tank mates and the fish don’t grow up to 15 cm. The fish can make a great tank mates with Oscar fish because the fish are tough, hardy and fierce to hold themselves against Oscar fish. Keeping the black convict cichlid together with Oscar fish when the fish is about the same size.

Placing them a huge different size, the Oscar fish may consume the black convict cichlid too. As long the fish are kept in the same aquarium with small different of size, it wouldn’t be a problem. The fish are comfortable with the temperature of 25-28°C and the fish are easy to take care.

Silver Dollar

Silver Dollar Fish

Silver Dollar Fish

This fish are one of the popular tank mates for Oscar fish. The fish have a unique body which makes a large which don’t look like a meal for the Oscar fish.  Another advantage about Silver Dollar is they act as dither fish.

Dither fish don’t swim alone but their swim in a group. Keeping Silver Dollar as tank mates for Oscar fish, place 4 and above because the fish is a schooling fish. The Oscar fish in the aquarium would also act less aggressive. The fish will reach it maximum size about 15 cm.

Green Terror Cichlid

Green Terror Cichlid

Green Terror Cichlid

As choosing green terror cichlid to be Oscar fish tank mates, there no need to worry about green terror cichlid because it is a completely reversed. Keeping green terror as tank mates, make sure the fish are slightly smaller than Oscar fish because the fish are more aggressive than Oscar fish. The fish can grow up to 20 cm.

The aggression of the fish will decline when the fish grow together. Keeping green terror cichlid and Oscar fish together are great but it would be bad with other type of freshwater fish in the aquarium. This is why having a backup plan is need.

Severum Cichlid

Severum Cichlid

Redneck Severum Cichlid

This fish are docile fish and they are large enough to stand against Oscar fish. The positive about Severum Cichlid, the fish are less aggressive compare with other Oscar fish tank mates. The fish can get along with non- aggressive fish which makes a suitable tank mates in the community tank.

The fish will grow up to 20 cm which are smaller compare with Oscar fish but they are tough against Oscar fish. Make sure keep the water clean and maintain the water temperature around 23 -25°C.

Jack Dempsey Cichlid

Jack Dempsey Cichlid

Jack Dempsey Cichlid

Keeping this fish as Oscar fish tank mates, make sure to keep an eye on the aggression of the fish in the beginning. The fish grow almost the same size of the fish but the behavior of the Jack Dempsey are pretty random. The fish might be aggressive and some might be docile which depend on luck. The fish can grow up to 22 cm and it is very easy to take care of the fish.

Plecostomus

Plecostomus

Pleco/ Plecostomus

This fish are pretty famous and the fish are feed with algae. Many aquarists purchase this fish purpose to keep the aquarium clean and less cleaning the aquarium. Keeping this Plecostomus as Oscar fish tank mates, there are some condition you have to consider.

Pleco have sharp spines on it fins and it is a huge threat for a hungry Oscar fish. The Oscar fish will try consume the pleco which end up a result of both fish dying. Housing the pleco fish together with Oscar fish, house them in a 100 gallon aquarium which Oscar fish are aggressive. The pleco fish can reach a maximum size of 50 cm if they are well care.

Fish Should Avoid In Housing Them Together With Oscar Fish

Fish are smaller than Oscar fish – Oscar fish are aggressive fish and they will see smaller size fish as food. Avoid smaller fish or slow swimmer fish which can fit into Oscar fish mouth.

Catfish – Catfish have spines on it fins which can kill the Oscar fish during the Oscar fish swallowing them. Keeping a large catfish is a great choice as a tank mates but keeping a smaller size catfish is a huge threat for Oscar fish.

Freshwater fish are sensitive with water quality – As we know, Oscar fish are messy eater which the aquarium tend to have high nitrates. The best way is to avoid adding sensitive fish against water quality into Oscar fish aquarium.

My Conclusion

After reading the post about Oscar fish tank mates, what do you think of? Mixing different species of fish could be fun and also challenging. Always keep in mind that prepare a 100 gallon aquarium if you want introduce different species of freshwater fish into Oscar fish aquarium.