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Alot of the time the clicking sounds you hear in your tanks are hermits and snails bumping their shells on the glass or rocks. I watched one of my tanks for hours trying to figure out where the clicking I was hering was coming from. After a while i noticed that every time I heard the clicks a hermit was walking into the walls of the tank.
If you dont have any broken shells its probably not a mantis. If you have hermits in the tank its probably a safe bet that the hermits are killing and eating your snails.
Joe - same goes for your tank, when you turn the lights out some hermits become active or make a mad dash for cover bumping into the sides of the tank in the process... Missing fish could be from poor water conditions or sick fish. Not finding its body wouldnt be a surprise depending on how many snails/hermits/other fish and other scavengers you have. I lost a hippo tang over night and I never found its corpse because it had been eaten by the oher livestock in my tank.
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-Dave-
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