Help with IDing

[tranzpoze]

Anyone know what this is? Started a few days on sand bed, now on coral.

Appreciate any insight, thanks!

Alk - 9.59
Calcium - 404
Mag - 1297
PH - 8.27
Ammonia/Nitrite - 0
Nitrate - 5.1
Phos - 0.16

Tank is some snails, 2 shrimp, porcelain crab and a Clown

Microscope pic is a little stale, can provide a new one if needed.

 

[tranzpoze]

Tanks is 4 months old, forgot to add that...

 

[tranzpoze]

Another patch today

 

[tranzpoze]

Tried H202 and cutting lights back. Haven't noticed a difference yet.