Looking for identification of nuisance algae

[Syntax1235]

Can anyone identify what is growing on my rocks. This stuff grew once I removed the sand bed in my sump.

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[blaxsun]

It looks like you may have a few different types.

 

[Syntax1235]

It looks like you may have a few different types.

It certainly does! Just wondering if there are any particularly nasty stuff here. The urchins eat it so it can’t be that bad. Time to put some chaeto in the sump.