Originally Posted by
cjworkman
I'm an expert on this subject, you're talking to the right person. hahahahhaa
I had a ton of predators in my rock shipment, as it came packed in water so was full of live creatures.
Mantis shrimp make a distinctive snapping sound. Sounds like a loud clicking. It will come in waves, mostly at night. If you never hear any clicking/snapping noises, it's not a mantis.
However, I also had 3 predatory crabs in my shipment that also helped in decimating my snail/hermit population. 2 were larger blue crabs with striped legs and white spots, one other is a smaller gorilla crab that still lives in the tank.
So if no clicking you might have a predatory crab hiding somewhere in there. They are difficult to find, especially if they are smaller in size and hide in the rocks. They also hunt at night.
I hear some sort of clicking...I assumed it was the hermits' shells tapping the glass. It is ALWAYS at night. I got my live rock from my lfs straight out of the water...a holding vat or whatever its called. It had all sorts of life on it...little bugs, brissle worms, some small corals, snails. Do the mantis move fast or slow? A couple of times I thought I saw something move rather quickly when trying to peek at everything at night, but thought it was my imagination. I think I will put on my camouflage tonight and go hunting