Possibly starting first ever small FOWLR SW tank and looking for info

[CGY_Betta_Guy]

I think the guy pictured above is a shrimp of some kind... heard 2 small snap/clicks (like static electricity) coming from the tank so either a mantis or a pistol shrimp?

1) I did also find 2 crabs in my tank as well.. can anyone ID these? This first crab will now be relocated into my sump.




2) bad picture but can just make out the legs dead center of the pic.


3) and after taking a pic with the flash of the second crab I also noticed this little black pod located just to the left of center of the picture right next to the bottle I used to trap the first crab. Kinda looks like a shell and has since dissappeared.