you guys are right, its got a brownish, yellowish tinge. I'm running an Eheim 2210 internal filter (I'm very limited as to what I can run externally as it is an in the wall tank which is viewable on both sides), I have a powerhead and I do have an airstone in at the moment because i'm worried that there isnt enough gas exchange from agitation of the surface.
I have two lights, a marine white and an actinic 14000k.
In my filter I have (starting from bottom up) a sponge with some matrix, next media box i have only matrix, next box I have clearmec and a fine sponge.
How can I clear up my water?