please healp me identify this

[sin]

http://www.youtube.com/watch?v=jZh3XetVLj8

sorry my camera is bad quality.

long story short i flipped over one of my rocks and found this really dakr greenish bubble like object.it looks sort of like it might be an egg but all i have in my tank is a maroon clown an anenome some hermit crabs and some snails.can anyone tell me if this is bad?

[copperband]

looks like bubble alqae just pick it but dont pop the bubble

[merlin0883]

i agree. don't pop it too.

[sin]

what happens if it pops?

[copperband]

it spreads

[sin]

i see.well i found two of them after a sweep of my tank and removed them both withought popping.thanks everyone who helped!

[copperband]

also emerald crabs eat bubble algae and if you have a large enough tank sometimes sailfin tangs will eat it