Hey Pie, do you have any of these in your tank?
And is it an Urchin? It is the size of a 20cent piece and was crawling up the back of the tank glass!
The spines are hard as a rock, but the centre body is softish and sticks to hard surfaces with immense force! I couldnt move it out of the cup!! It was stuck so hard!! The hard spines wiggle slowly all over the place.
COOL!!
Good, or bad in my tank....It is sitting in a net until further notice!!
I noticed it this morning at 4AM just before starting my 25% water change that was 2 weeks overdue!!