Join Date: Nov 2002
Location: Joplin, Missouri USA
Rex is absolutely right. I can tell you from experience. When I started dosing a small amount of phosphate, my algae problem almost completely disappeared. It took a while, though. It goes against the old tradition that phospahtes cause algae... I think we're finding out that too much OR too little phosphates cause algae.
With too little phosphate, plants can't use the other nutrients as efficiently. Also, phosphate is one of the prime constituients of DNA. Your ammonia/nitrite/nitrate processing bacteria colony will suffer as well if phosphates are zero.
Fish food contains some phosphate. If your fish load increases (adding new ones or old ones growing) you may find that your need to add additional phosphate (and nitrate, if you're adding that) decreases. Go slow and test regularly till you get a feel for what your particular tank needs.
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