Thinking about buying another Rena XP3 as I love the one I'm using on my fiancee's turtle tank. Just curious if one XP3 is enough to sufficiently filter my 55g stocked with 3 juvenile ebjd's and a few small tetra's. I have two aquaclear 70's on there currently and the ultimate goal would be to get rid of both of them and get the canister. I'd keep one running for now and seed the xp3 with media from the other. Any input is appreciated.