Chemi-pure

Chemipure works great. I have mine running in a canister connected to my sump. Also run regular carbon in the canister too.

if you have never used carbon on your tank, you will notice a difference within a day or two. It will clear your water column, remove yellow tint and allow more light to penetrate to the corals. A lot of people complain that their corals started acting funny after running carbon and its usually that they are getting "blinded by the light". They adjust after a few days though.

 

I run it in my fluval canister filter that I run alongside my sump.

You can drop it in your sump as well.

You can put it in the overflow box, as long as it won't constrict flow.

ANywhere that water moment is steady.