yes i do have a maroon clownfish actually. i'm pretty sure that's not whats making the click however. one day i actually saw all of my fish FLINCH when we heard the click lol
it's mostly one click about once a day, but sometimes i hear 2 or 3 clicks in a row! i'm suspecting it has to be a really small mantis living in my live rock, i look underneath my tank and look at the sand and it looks the same every day, no holes or burrows have been dug by anything
for now i'm seeing no harm done, but man i sure do wanna catch it one day before it starts getting bigger and turning into a problem! i have many hermit crabs and snails, none have ever seem to have been messed with, that's why i'm thinking it's gotta be really small
every time i set a trap my snails just go in there immediately. how can i work around that?