Help with ID Dino or Cyano

[hankacrank]

Hi guys, for the past week or two, I've had parts of my sand bed turn brown towards the back third of my photo period and I stir it away. This brown stuff also grew on some zoa frags and made them close and I had to turkey baste it away..I've increased flow and it's less of a problem on corals but it's still turning up in the sand bed.

Nitrate has been less than 5 and phosphate has been 0.04. I pulled GFO out of my tank last night to try ousting phosphate levels up. I didn't want to take any other drastic measures such as cutting out the lights before I was sure what I'm actually dealing with. Please review this photo and let me know your thoughts.

 

[NS Mike D]

PO4 0.04 and NO3 < 5 is good. Keep an eye out for rising PO4.


Need a microscope pic to tell if dinos and what steps to take.


I concur, no drastic steps yet