Hi guys, new to the forum and the hobby as well.

Im having issues with emeralds crabs dying in my tank. 3 of them to be exact. They have lasted from 1 day - up to a week. I keep finding them upside down on their back's.

All my hermit crabs and snails are doing fine though.

I drip acclimated every time for about 45 mins and double the water.

Age of tank: 2 months
Size: 30 Gallon
Temp: 78
Salinity: 34'ish 1.025 Gravity
Nitrates: 0
Solphates: 0
Alkalinity: 8dkh
Remora Protien Filter

Regular weekly water changes, same salinity and matched temps

Using RODI water
Live sand, live rock, 1 mushroom and 1 cluster of polyps

6 Hermits 2 Turbo snails 1 white shell snail
2 Clown Fish 1 Tail spot Blenny

Good amount of film algae growing on the live rocks

Any advice or insight would greatly be appreciated!?