Sounds like Dinoflagellates alright...All Algae are a combination of 4 basic ingredients - Light, Phosphates, Nitrates, and CO2 (carbon dioxide). There are other ingredients depending on the species involved (e.g. Diatoms need silicate for their shells etc.) but Dino's have cellulose shells so there is no angle to work them there. I would suggest you keep your KH high, dose Kalk to precipitate phosphates, and cut back on your nutrient input from food, water source. Maximize your nutrient output and clean up and out...make sure when you clean them off that you are getting them out of your system, not just freeing them to float around, decay, and produce more. Good luck.
Stephen
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