I have had many octo-tanks before, but my current tank is a 75 gallon reef. I am trying to convert this tank for small cuttles. (bandenesis). I have a DIY hang on the back refugium with macro, a fluidised media filter with phosban, and a bak pac skimmer. Currently im having hair algae problem and blame it on my sand bed being saturated. My plan is to minimalise everything in the tank. I want to remove much of the live rock and have just a small structure in it. I will also remove the whole sandbed and go barebottom. However, I am concerned that with a cuttle and reduced amount of liverock, that I will not have enough bio-filtration. I still want to keep some corals in the tank... Will using a Eheim professional wet dry canister filter 2227 be a good choice? Having been in reefs for a while, most people are against canister filters because they eventually make nitrate levels rise. Would there be problems with this setup? any comments would be appreciated..