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I'm freaking out! Hubby bartered for this LR with coralline and some corals and I see this! Is it what I think it is?? Aiptasia?

We're starting to have hard brown stuff growing in our tank too! It's on the corners and does not come off when I use the magnet glass cleaner. We had our run of diatoms that is almost gone. Ours are just tiny dots but I don't want them getting any larger. We are starting to grow purple, red...

Just to close this out, I found something online about this and it seems like its a jellyfish...before it buds off. Thoughts?

I've not tried to or have seen any of the fish bother them. They are stationary. Nothing changes about them...no growth (length and width) or movement.

Can anyone tell me what this is? I couldn't find any reference/picture of it on any of the reef tank sites. It's white and has a round center.