Hello im new to this site and to taking care of fish. I just want a cool fish for my 55 gallon tank. I was thinking of getting one Tiger Oscar but everyone seems to say that it wont be happy. I cant afford a bigger tank any time soon but i am really interested in the fish. I also noticed people saying 25% water change i dont really understand what that means. My family has had a small 10 gallon tank for a long time and i never seen them change the water ever, we usually let the filter do all the work. But i want to make sure my oscar would grow to its full potential and be happy. I am willing to try tips u guys are willing to give me. I also read up that Oscars eat insects and you should feed them worms and brine shrimp and bloodworms, if this isnt true please tell me what is best for them to eat. I also picked out the Oscar because i hear its an aggresive fish, i was really excited to throw in feeder goldfish but some sites that i have read say that is bad. I just want to make sure i know the facts before i get the fish and thats why im asking you guys, because it seems to me you guys are legit and know your stuff.