what is this

[christyf5]

Ya know, looking at that third pic you posted I'm not convinced its dinoflagellates. Is the algae producing bubbles at all because that is a telltale sign.

I would try to get your water parameters in order first. Go with what Bill said about the lights off for a couple days or reduced photoperiod. Try the list I posted and get all your parameters in order. If the algae still persists and is that much of a problem then I'd think about some more drastic measures.