An imbalance or overabundance of nutrients and too much light or running the lights too long seems to be the consensus. I have it and I don't dose but I do keep my lights on about 10 hours a day--48W T5 on a 20 long. So for me, I'd say light is the problem. I have 10 Amanos, they cleared it out when they first moved in, but now they just ignore it. lol
My First Shrimp Tank
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