have a cpr backpack. works better than my sea clone 100. Got an octopus hob to replace cpr. it works soooo much better than the cpr that i took the cpr off. I highly recommend it. you can get a few different models. either the normal, one with a space for mechanical filters, one that surface skims with a space for mechanical filters, or a double powerhead double catch cannister model. i got the surface skimming one cuz i always have my arm in the tank, target feeding or rearranging, and oils occumulate on the surface of my tank. it was only $160 new. fyi