My mushrooms extend to about 3x their "deflated" size every day. I would think that what your seeing is the normal expansion. True growth seems to (IME
) happen much slower than that. When they retract at night do they go back to roughly the size you put them into the tank at? I think if you compared their retracted size it would be a better indicator of growth.
Congrats on the black tube opening more (did I miss the pictures?!). My yellow didn't have any recession when I got it so I don't know for sure, but I do know that a goni and SPS
will grow back over dead skeleton during regrowth (easier to add skin then form skeleton?) but then again they aren't "separate animals" as the sun polyps are.
Did you do anything to encourage your BTA? Mine is still happy behind the tank. I tried feeding it last night but I can't really tell if I'm hitting it or not since I can't feed and see it at the same time! I think it might like the spot it is in because it is able to escape my clown by going between rocks so I haven't really tried to move it yet. How often does your BTA retract? I see mine do this what seems like fairly often, but I'm not sure how often it is normal for it to happen.