ID please

[Dearth]

It comes in many forms, sizes and several colours most common being reddish brown, Brown, white and clear(opaque)

[lastlight]

i'm sure not seeing aiptasia in any of those pics. i was thinking sponges or something like that.

[ScubaSteve]

Sponges.

[mameroo2000]

sea squirt and they are harmless
It my com with diffrent colors or just white

[asylumdown]

Yah in the better pictures those are clearly a sponge/tunicate, the kind that like to live in the dark or in the shade. The first pic did look a lot like aiptasia though.

they're a good sign, so don't worry about them!