Hi Christy sorry to hear that you are having problems, but thats no reason to give up. Listen, it's time to fight back even harder. Base on what you mention, it seems like your 3-4 inch sandbed may be a factor here. I suggest either reducing the sandbed, I don't have deep sandbed in all my systems, take the sand out and bleach them, yes bleach them, don't worry about the bacteria, you got rocks. Switch over to not so fine sand but the carbisea seaflor super reef, if you don't want to spend a nickle at all, keep what you have but reduce it. Dinoflagellate are toxic to most invertes, snails, and fish possibly. If you have a few death lately of snails, you can be sure. But sounds like your system has quite alot of nutrient base on what your skimmer is pulling out. Keep your skimmer clean and functional 120% at all time. Disturbing the dsb probably provoke nasties to the surfaces. I have confident that you will win but don't give up. Plus don't add anymore additives at this time. Regards Ken
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