ID circles on glass

[mrskueny]

Im not sure what the dots are on my tank ,, they are very hard to clean off and they are green

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[mrskueny]

What. Is this called,,and will it grow on other rocks

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[Dav3]

1) coraline algae.
2) sponge. Harmless filter feeder unless it overgrows your corals.

 

[mrskueny]

Thanks for the help im kinda new at this and after all this time now stuff is growing and i would like to know what it is so thank for your time its helpful

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