What is this?

[jdwmba88]

Just showed up recently

 

[CCauthers]

Looks like possible bubble algae

 

[terraincognita]

Better photo if possible would help, try to take it straight on with the aquarium not at any angle.

Otherwise google bubble algae, if it's not the same looking thing, then take a better photo for sure.

 

[Paleozoic_reefer]

Uh-oh...bubble algae. Try to remove without popping them!

 

[vetteguy53081]

Can you take a clearer photo and under white lights?

 

[40g Nano]

Maybe get a small emerald crab
Look like bubble algae

 

[Auquanut]

+1 on the emerald crabs. My foxface also nibble at it. Between the two, they almost keep it under control in my tank.

 

[Pistol Peet]

Looks like bubble algae there's a crab that eats this algae can't remember its name know somebody else here might know what the name of that crab is no it's not Mr Krabs from SpongeBob

 

[Pistol Peet]

Looks like bubble algae there's a crab that eats this algae can't remember its name know somebody else here might know what the name of that crab is no it's not Mr Krabs from SpongeBob

There it is emerald crab

 

[jdwmba88]

Ugh! I think k it is bubble algae. What's strange is i have an emerald crab slready

 

[Mikedawg]

If you can remove the rock and then remove the bubble algae you're golden!

 

[40g Nano]

There are some rumors that if you pop the bubbles, it will release spores and spread

 

[Biglew11]

I've had a few emerald crabs and not one has ever ate bubble algae.

 

[Pistondog]

Don't worry about popping. They can be manually removed twisting, etc. My emeralds don't touch it unless they're very hungry.
Maybe the largest single celled organism.

Valonia ventricosa - Wikipedia

en.wikipedia.org

 

[John08007]

Thats clearly bubble algae, if you pop them they will spread more. I used a tank vacuum and picked them out while I vacuumed. Emerald crabs also help, heard they sometimes won't eat it thou