I've been reading around trying to figure out the "best" filter for my 45 gallon planted tank. Right now it's got whatever HOB came with it, but I'd like to go with a canister tank. Reading around here, I've settled on a Rena Filstar. I'm thinking the XP2 would be appropriate. Is that about right, or would I need to use the XP3. My tank is sort of mediumly planted and will be towards the heavily stocked side when I finish stocking it.