Over the past two weeks I've had a little bit of an ich problem

. After reading alot of these posts and talking to a few fish locations around my area. I have bought 1 cleaner shrimp, replace filters, added garlic to there food. So far all is good. The only problem I am having is that the water has a greenish tint to it, and it won't go away. any Ideas? The onlythings i'm running are 2 hangover type filters and a gravel filter.
Thanks in advance