Thanks for some great inputs you guys....Actually if i had the cash i would go with the eheim 2080, but right now i'm leaning towards the fx5, the rena xp4 have some terrible reviews online so that's off the charts and maybe that's why it sells a lot cheaper than the other filters. As for stocking it will be mainly community fish like tetras and i might get a group of angel fish...if i get the fx5 i will also hook up my eheim 2217 just for back up...