Ok, I have about $200 to spend on an upgrade to my 125 gallon planted discus tank, I don't want crazy amounts off current but I want really good bio and mechanical...............right now I have a fluval 405 and an aquaclear 110 running along with a sponge filter.............everything works pretty good, but I have some extra money and was looking at other canisters. So, used, new, eheim, fluval?? what?