I have a 125 gallon tank 5ft by 2ft by 2ft and im using an Undergravel filter and a sponge filter. What kind of filter would you recommend? I have heard of an ac500 but i need to know where to find it at and what kind of filter it acctually is? What is the best kind of filter to run on my tank? I have 2 6 inch reds and 1, 4 1/2 inch red and i just ordered a 6 inch caribe would it be alright to put the caribe in with the rest of them?
SLim

SLim