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I have a 75 gallon tank with a 3 inch oscar. Im wondering could I put some type of catfish with him I dont want a pleco because they are dirty but what about a small catfish?
They are not the worse when it comes to bioload. They are no where near to what say a pleco is but every decent sized fish is going to have a bioload. As got their find every catfish that you could put in with you O without getting killed by him is more than likely going to have some nasty fins. It is a method if self defense. If your O tries to go after them he will learn his lesson quick and leave them alone.