Okay first things first. I have a 30gal tank that has been set up since Halloween '05 that is planted with a few rummynose tetras, a few white clouds, and a few otos. Right now I have an AC50 and want to put an RENA XP2 on there. Now I want a few discus for the tank. My question is would the XP2 be too much flow for a 30g with discus? I know that for 30 the XP2 would be more than enough filtration, but i dont want the flow to stress the discus.