07-31-2010, 01:05 AM
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not by themselves, no. I have used them in the past as part of a regimine because they are cheep and available fertilizer. The main idea behind it was to add phosphates from the substrait as opposed to from the top of the water. They must be used in small amounts and augmented with additional fertilizers. My feeling was that they desolve too fast and some of the chemicals can be harmfull to your fish in anything but the slightest concentrations. Plus I dont have any problems with adding phophate directly to the water so why worry about it.