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Aren't hydroids little jelly fish that stick to the glass? No matter. From the pic it looks like it may be aiptasia. I can't tell for sure from the pic.
almost positive its not aiptasia. I've had aiptasia in my tank and this looks absolutely nothing like it. these are not growing rapidly like aiptasia does and they do not retract into my live rock when i touch it.
Don't think they are hydroids (but there are a LOT of species, so who knows) but it does kinda look like a glass anemone (aipstasia) to me too. There are more than one species, and they do look different.
Im sure that's not aiptasia. I have those too. They look like tubeworm. They have a hard tube and the "tentacles" look like aiptasia's tentacles but smaller
They do look like a type of colonial hydroid to me. If they are, they will flourish in high nutrient tanks. They can be controlled through water changes and time. HTH
The tubes on these do not retract at all and is also hard. The tentacles look more like a single layer of hairs than they do tentacles and that is the only part that retracts when you touch them.
They really arent that big at all. the largest one is maybe half an inch long. the diameter is maybe one eighth of an inch, with the hairs being maybe a quarter inch.