Unfortunately as docile as Oscar fish are around humans they can be relatively aggressive when raised in a tank. Opting for a larger tank can reduce some issues related to aggression try to keep a tank that is at least 75 gallons in size. But as they can get very large you will also need a large tank of at least 100 gallons to keep them.

As a result you need to make sure you select your tank mates and the tank itself quite carefully.

Oscar fish Compatible oscar fish tank mates. Besides sailfin pleco is a nocturnal fish so it will stay active during the night. And during the day it will mostly hide near ornaments or driftwood or plants in your tank. They would make great fish tank mates for the oscar fish because of their peaceful demeanor and also great looks. They can grow to up to 6 inches in size. While the oscar fish can be aggressive towards other fish it is mainly against smaller fish the silver dollar fish is quite big and you don t need to worry about that. What are the best tank mates for oscar fish Though oscar fish is very aggressive there are some good tank mates you can keep in your oscar fish tank. Usually other cichlids that are similar to the size of your oscar fish are very good tank mates for oscar fish. Also there are some other species of fish you can keep with your oscar fish.

Most of the fish i am going to recommend as tank mates will require a minimum of 50 gallons just for themselves not including the oscar. Choosing tank mates that are suitable. Remember that you can t put any fish in with an oscar you ve got to choose fish that will be able to live in harmony with your oscar. The majority of the fish that i have suggested as tank mates will require at least 50 gallons just for themselves excluding the oscar. Picking tank mates that are appropriate keep in mind that you can t put any fish in with an oscar you must pick fish that will have the capacity to live in congruity with your oscar. If you must keep other fish with your oscars be sure you have plenty of tank space and avoid selecting tank mates that are significantly smaller than your oscars. Oscar fish are best kept with similarly-sized species such as larger characins some of the more robust cichlids as well as larger cyprinids clown loaches eels and catfish. An oscar only tank is probably the best idea if you want these cichlids. If you are looking to turn your tank into a community then you ll need to choose some large passive fish that will stay out of the way while also being able to defend themselves. Oscar fish aggressive nature can cause tank mates to live

I have a small 5 red tiger oscar in a 29 gallon tank. I had a 8 koi in there with him and the koi got beat up on.so i m guessing i got ahold of an uncommonly aggressive oscar. I took the koi out and put him in my other 29 gallon tank where he is much happier but since i took him out the Baby oscars need at least 30 gallons of water per fish. However a 75-gallon tank would be ideal for a single adult oscar fish. A commonly preferred minimum tank size among the oscar-loving community is a 55-gallon tank. But experienced aquarists and pet shop owners suggest that a 75-gallon fish tank is ideal for an adult oscar.

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