blue tides > red tides
http://t0.gstatic.com/images?q=tbn:ANd9GcTyXTHnHkfQ6YslgupfiS_ei5oxmKmpCR4kWQT8Od32hIhLov8U
basically still plankton that blooms, but not as toxic and glows.
edit: found some videos i was trying to find
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There is no shame in not knowing; the shame lies in not finding out