Hello! I have 5 two year old piranhas currently in a 55 gallon tank, got a new 85 gallon for free! It has three parts in the bottom of the tank I am assuming for a sump tank?? I have no idea about sumps. Will try to figure out how to post a pic to this. Anyway, advice on the perfect setup? Substrate, how to set up sump, filter system (undergravel?) ? Any advice would be super appreciated!!!
