Can anyone tell me about the fan thing... The white spot just above it a little white Tetralia nigrolineata crab.:nod: The acro is super healthy, I just don't know what that fan thing is.
Yes, they get inside them all of the time. Almost every wild acro I get has some in it when it arrives. They typically due in a few weeks, but might still keep kicking it of you feed your acros often. Thy bore out the acro skeleton and live inside there, you can see it spinning around making more space if you look at it frequently.