Well I have had my 60gal tank over 5 mths and have 2 cleaner shrimp (for 3mths), 5 fish slowly added for over 3mths and 2 peppermint shrimp (1 week). The problem I have is that I have been hearing clicking noises for 4 out of the 5 mths that I have had the tank. Lately it has been clicking lots in sprits of 3 at a time. I have had no disappearances or injuries. Could this be a mantis or a pistol shrimp. I cannot find out what is making the popping, I am now starting to get worried that the tank may be cracking but do not see any signs of that either. Should I be worried ?? Does anyone have any advice ??
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