I'm going to assume you have live plants inthe tank, but good question Fishdanny. most likely you are running you lights to long, 8 to 10 hours is the most you want to run. If you plants are young or you just have a few plants than the adding the ferts has cause an im balance in the water. Cut you lights down to 8 hours. Also list the plants you have in the tank. You may wnat to cut down the dosing to half until the plants grow large enough or you add enough plants or have fast growing plants, to use the excess nutriants.
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