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Christopher4125
Vanessa
With this size, it's difficult. It could be a discoactinia.
Charles894
looks like a sponge
Brandy
It doesn't really look much like discoactinia or a sponge. I'll try to borrow a macro mode soap dish from one of my friends and take more quality photos, especially since there are a couple more animals to identify.
David4968
better with micro mode
Allison
Odessa, in cameras, this is called macro photography. I have such a mode.
Jesse
A couple of days ago, I doused the aiptasia with boiling water from a syringe; it seemed to disappear, but yesterday I noticed colorless tentacles sticking out from the opposite side of the hole where it was. Is it that it didn't die and is recovering, or is the little corpse being washed away from the rock? I don't want to poke around there too much since there are two more corals on this rock (live rocks).
Catherine
Try to block it in this hole with a piece of foam, using tweezers, push it in there; they, the aiptasia, are often located in recesses, and in that way, they can be buried alive, in cases where it is problematic to remove the substrate.
Aaron580
Another option: try to pour boiling water through the needle, and then "suck" the remnants into the syringe...
Diana3118
I found a magnifying glass and took some photos; they turned out fairly well considering they are 5mm in diameter.
At first, there were a couple of them, but now there are more than ten. I can't figure out what they are.
Richard2180
There were such. Harmless hydroids.
Alejandro
Phew, that was close, I was starting to think that so many IP addresses had popped up.
Andrew4194
Don't attach so much importance to it.