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Anyone have an ID on these guys? Have treated with bleach 3 times, done two blackouts, and currently am using H2O2 to slow their spread. They keep coming back:-/
Amphidinium operculatum or similar. It's slightly funny shaped, but that kind of chemical stress can cause shape change.
One recurring issue we haven't dealt with in all these chemical treatments is how the sandbed protects from chemicals. (Especially amphidinium that can go down into sand at night)
Think how much organics are trapped in sand and how much oxidizer they could neutralize.
You imply that bleach reduces their presence, so next time you treat - turn a powerhead into the sand and blast every single grain of sand up into the treated water flow.