If dinos are gram negatve then Chemiclean should kill it (unless it is resistant . . . Which bacteria can become). Chemiclean only kills gram negative bacteria. Gram positive bacteria (like your tank's biofilter) are unaffected by it.
The suggestion that dinos are gram negative seemed to be little more than an educated guess. Since you saw a reaction from whatever it is that you've got growing in there, I would guess it is gram negative: whether it be cyano or dinos.
I personally would try it again, providing the kivestock handled it well, but I'd give it a little bit of time or do a couple more big water changes before doing so.
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Shelley
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