I can just tell you about mine. When we got it 7 months ago it inflated to about 3 1/2 inches across and had plenty of room around it on the sandbed. Lately, it is huge! It is at least five inches across and sometimes inflates in spots up to an inch off the sandbed. It runs out of room and starts to creep up the tank wall a bit. It is by far my favorite coral in the tank.
Thank you,
I've had mine 2 weeks now,its about 5 inches across & like you,it's my favourite.Fascinating to watch & feed.I wondered how big they got because i don't have an immense sprawl of substrate.The woman at the LFS where i got it didn't seem to think it would grow much more but i wanted to check.
Rob.
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