I would say a mantis shrimp, but the fact you have a frog's croak sound baffles me.
I too have the knocks, I have had it since the beginning, so I think I got a mantis from the LR, never seen it, nor have I ever seen any piles of sand. So I am thinking it lives on the backside of my rockwork.
The Frog's Croak really baffles me, I don't shrimp croak!
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Setup: 180G DT, 105G Refuge (approx. 300lbs LR, 150lbs Aragonite)
Hardware: Super Reef Octopus SSS-3000, Tunze ATO, Mag 18 return, 2x MP40W, 2X Koralia 4's Wavemaker
Lighting: 5ft Hamilton Belize Sun (2x250W MH, 2X80W T5HO)
Type of Aquarium: mixed reef (SPS & LPS) with fish
Dosing: Mg, Ca, Alk
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