Dinos are usually a dark brownish algae that forms a nasty layer over everything, generally starting on the sand. It will start off in thin layers here and there, but eventually will start to get thick, stringy and will be full of air bubbles. If you don't have a microscope a way to sort of gauge if it is dinos is the speed it grows back. If you clean your sand and it reappears within hours or even less its usually dinos. It can be one of the hardest forms of algae to get rid of. I have read about a lot of different ways to get rid of it, none that seemed to work for me. I eventually did a total black out for 3 days, and that solved my problem completely.(Look into it before trying it) Anyway I hope it isn't, but if it is maybe this will help a little bit.
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