What is this growth on live rocks?

PoppyD88

Is this growth on my live rock good or bad? The live rock has been in my tank for about a month. There’s about 40lbs of rock. I don’t leave the lights on often, I leave the white led light on from 10am-7pm, then a blue moonlight from 7pm-12am. I turn all lights off after that until 10am.
 

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Jayd976

It’s a natural part of the cycle process, dinoflagellates. It easily scrubs off but as the tank matures a little itll disappear on its own.
 
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Jesterrace

It’s a natural part of the cycle process, dinoflagellates. It easily scrubs off but as the tank matures a little itll disappear on its own.

I think you are confusing dino with diatoms. Big difference. Diatoms will scrub off easily and go away but what it appears he has is Dinoflagelletes (at least in the pictures on the left) which is usually the sign of bottomed out nutrients in a tank (ie zero nitrates) and needs to be addressed or it can cause serious problems.

The OP, you are definitely running your lights too long. Shouldn't be more than about 8 hours total of light unless you want algae issues. Are you using RODI Water or Treated Tapwater?
 
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Jayd976

Yes I meant diatoms. But was unable to edit the post to correct.
 
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CannonsFish

I agree, think it is just a part of cycle. How many gallons is your tank and what lights do you have that can help determine how long you should have your lights on for.
 
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aquachris

Ahh the fun beginning of the ugly stage lol.
 
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