I was lookin at my tank and saw this mound of sand against my glass and it has a hole from the bottom to the top like a tube is there an animal in there????:notsure:
I get the same thing at times.... a few times I saw the sand getting pushed out the top, but never saw the critter. However, there always seems to be a mini-brittle star in close proximity.
Coincidence? I really don't know.
