IMO thats not dinoflagellates. Firstly, dinoflagellates look like brown snot trailing in the breeze swamped by bubbles (the bubbles go away at night and reappear during the day). Secondly, snails won't touch it, they'd rather shrivel up into their shells and die on the sandbed before making trails in it. I think you're dealing with diatoms there. Diatoms do utilize silicate and they do it quickly so there is a possiblity that it could be your problem.
Have you changed up your lighting schedule at all (ie. decreased photoperiod)? That might help.
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