I have a aqua clear 110 and I had plans to buy the octopus classic. What about a refugium?I run a 90g with all HoB equipment. I use an aquaclear (or what ever brand) HoB filter. I keep a sponge, floss and carbon in it. Helps with cleaning the surface and floating particles. I also use a reef octo classic HoB skimmer which I love.