brown dusty algae

highfive52

FISH and CHIPS
Brown dusty algae on sandbed. Never grows snot or bubbles. Its not red or green. Its dusty. Goes away at night comes in afternoon. Adjusted light intensity and photo period. Cause and how to eliminate. Not on corals or rocks. Weird. Annoying as all get out. Tried upping nutients...nope. Tried lowering...nope. Fed phyto a bit. Nope. Alk 8.65 calc 420 mag 1400 phos .06 to .09 nitrates 11 to 15. Steady hanna and trident. All numbers checked and rechecked. What gives.......
 
Looks like this?
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