help..my water has a green tent to it..?? what causer this...not sure what my water test at but the guy at the lfs said that my water is fine..I also added some phosphate padding ( it's like filter media) about 3 or 4 months ago ..and my water is still green..i also did a 10 percent water change about a week ago..so can anybody please tell me what cause this.? and how to fix it.?..thanks:help2: