Please help identify: Cyano or diatoms?

Ldolor2

New member
Hey guys, i have a relatively new tank and I'm curious to know if this is cyano or diatoms. The tank never had any trace of ammonia due to the amount of live rock during the initial cycle.
 

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Diatoms it looks like, if it blows around easily like dust then it is indeed Diatoms.

Cyano is usually red but could be a dark brown depending on your lights and disappears with the lights off and shows up lights on.
 
Hmmm, it does disappear with the lights off, but i wonder if that's because the tank is dark haha. However, it does blow off very easily with a turkey baster. it's not like it blows off in chunks, it just disappears.
 
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