+1 on this hob refugium/breeder. I have the one with the 10" fugeray and mini powerhead mounted on my 6.6 bookshelf tank. I am using it to house my sponge filters, media, heater( until my mini heater died) and as my co2 diffuser. Great little setup, although I mounted my powerhead inside the refugium instead of in the aquarium on the intake as suggested. The flow on the micro powerhead is adjustable too which is nice.