Originally Posted by shageman

first off you should read more on the fish before you buy them, the Dempsey will fight each other and hurt the Oscars. They are very aggressive and you have way to many fish in a 55 gallon tank for them kind of fish. Oscars grow very fast and a single oscar will eat 100 feeders every other day to stay healthy, now the next thing is the fish will rip thru the nutrients in the water and begin to get hole in the head, this will not kill your fish if you slow it down but it will never heal, so now you have fish with big ass craters all over their face. My theory on your tank is one the dempseys will fight and one will die, the other is that you will end up throwing the dempsey out because he will start to attack your oscars, if you read up on oscars they need 55gallons atleast to themselves, you have two which would need to be 110gallon tank to even give them proper growing room etc. As far as my tank goes i have 2 red oscars in a 110 gallon tank, very little decor as oscars will rip up anything in the tank and move shit around so no point in it, we go thru 1k or so in feeder fish every 3 to 4 days.