what is it?

i have some of that, its a type of macro algae. dont know the name

I believe it's a type of bubble algae.

get rid of that red bubble algae! I had some and it took over my tank. I only got rid of it when I chipped all of it off the rocks when I took down the tank.

yup, 100% red bubble algae and it's very hard to get rid of once it gets in your tank and it spreads like crazy.

........and I thought it was a booger..............

Pop it

do not pop it, that releases spores all in your tank...

"pop it" lol...

yes, DO NOT pop it

Well, there's red bubble in this pic, but I think what he's asking about is the red one with orange spots, it's a cool macro, idk the name though

I'm asking about both/either

the one that is asymmetric, on the right, looks a little like bubble algae, but not really. the neon orange spots are pretty different.

the other, round, bubbly one on the left--- I have been eyeballing it and thinking it is probably a nuisance algae.

In any event, I've never seen anything like either of them and welcome experienced opinions and anecdotes.

Red bubble algae. It sometimes looks like that.

They are one and the same...the larger one with the dots is mature and ready to burst and spread her evil spores all over your beloved tank !

ahh

bummer

pretty stuff in small quantities, but I wouldn't like it so much if it covered half of my rock work

It should be easy to trim it out w/ the maiden's hair

That bubble will turn into a red leafy macro. I have no idea what it's called. Had it in my tank and did not hurt anything or take over. My urchin made short work of it though.

Dolphin larvae.

I got this off the web" "Manual Removal – Don’t be clumsy and spread this one. Get em small, cover them with a baster, scrape the baster along the rock, when the bubble comes off release the plunger and suck it up. Discard and repeat. If you have a lot to do, by the time you are done you will be ready to add new mixed water to complete the water change. Be aggressive with your manual removal.

Clean Up Crew- Emerald Crabs

Why it happened – You didn’t quarantine, and you have available nutrients for it.

Starving it out – Use a phosban reactor or a macro like chaeto to take down phosphate. If you have a nitrate problem too, you can add more live rock or rubble to the tank, do some more wcs, add macro, add dsb, etc…

John’s Tip – Juvenile Emeralds are better for the task, the smaller the better. Get one per handful amount of the bubble. (After aggressive manual removal, remember to limit based on tank size etc….that recommendation is only based on the bubble algae – it does not consider the crabs needs do your research, etc….)"...

Hope it helps

what ever you do, take the whole rock out of ur tank, get it off, then return the rock. my $.02