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Gore15

Any idea what this macro algae might be?

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Gore15

This has been growing in my tank on some live rock that I got from a community member. I cannot be sure if these are good or bad for the tank. 
 

any hint is welcome. Thank you. 

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Frozen_Reef

Ulva

 

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sublunary

Looks like ulva, aka sea lettuce to me.  It's a good herbivore food and a decent nutrient sink.  Cool to have it growing right out of a rock.  My only problem with ulva has been sometimes snails eat through it and send pieces floating right into the filter.  It can block overflow grates and such (I almost flooded one of my AIOs that way) , so just keep an eye on them.  

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