I continue to hear the clicking at night and during the day af first we all belived it was a mantis shrimp. But i speculate that i couldnt b/c 1st i cannot find it, 2nd none of my snails, hermits, or my 3 cleaner shrimps have died. So wanted to kno what i most likly could be people tell me it could be the snalis on the glass but i need professional confirmation