You have an algae bloom... basicly. you need to turn off your lights for a bit.. this happens occasionaly in my FW tank when I get lazy (atleast I admit it ) .. and things get out of wack.. Do some water changes with good RO/DI water. and cut down on the lights.. or better yet. cover the tank with a dark material so no light gets in. Another thing that works, (not sure if this is available for marine tanks) but it clumps particals together. that way your mechanical filter will take this stuff out. I've used it in my FW so I didn't have to darken the tank. But definately do water changes.
P/S if the water change made it worse.. I think you may have a poor water supply. High phosphates or nitrates.. go to a local super market and get some RO water.
Chad
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