This might be a stupid question but I was using my cannister for my carbon, phosban and de-nitrate. Now that I'm getting into sps, I want to do things correctly and be more careful with my chemistry. Should I get rid of the cannister and buy a gfo unit? I saw one on brs with 2 chambers but doesn't the fluval do the same thing, except the flow can't be controlled. Is it neccessary to buy this or can I keep using the fluval?
