Hello, I'm pretty sure I have dinoflagellates developing. They are in the sand bed and I think brown or red matts with strings streaming up with bubbles on the end. I've read some things at reef2reef and other places so I know some of the approaches. I just wondered if anyone here had any suggestions. To give you an idea about my setup its 10 gallons (8 displaced, probably 8 lbs. carib-sea life rock) with another 10 in the sump. Temp. 76 Salinity 1.025-6 Mg 1425 Alk. 8.5 Ca 420 Weekly Water Changes (5 gallons), Fritz Pro RPM Salt, Siphon all the sand Blow detritus off of rocks and corals and clean glass once per week Bi-weekly change of 2 tbsp. rox .8 carbon Big ball of Chaetomorpha algae in sump (I've read that this can be a cause) 2 g auto-topoff with 2 tsp. / gallon kalkwasser Nitrates < 5 Phosphates .08 (this measurement was taken after a few feedings so I probably need to test again later. I know people say low or 0 nitrates and phosphates can cause them so I've started to up my feeding a little.) 2 clown fish, 1 small crocea clam, 3 cerith snails, 1 mexican turbo snail, and 8 small corals hard and soft. I feed the fish small Hikari pellets. No more than they can eat. And I've just started to feed phytoplankton and reef roids. Filter sock changed weekly Small skimmer which mostly provides aeration. Lighting is Kessil Tuna Blue for hard corals and Kessil A80 for soft. Lighting from 8 to 4 and 5 to 5 for the Kessil grow light on the Chaeto. For flow I have a gyre 230 on low, small overflow box and return of maxijet 900. I would like to get it before it spreads any further. Thanks for any help.