unknown plant

[repman]

Hello can anyone tell me what kind of plant this is growing on my rock? Have it in 4 spots

[Pili4444]

Bubble Algae. It can get pretty annoying and emerald crabs are the only thing that i know eat it (although mine doesnt seem to).

[winniebagel]

Most people find bubble algae to be a nuisance, especially once it starts spreading throughout the tank. Best to nip this problem in the bud before it becomes an outbreak. Manually removing the bubbles (while rock is not in the tank) is a good way to go. Try not to pop any of the bubbles though - that's how they go about spreading.