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I'm no expert on crabs, but the same advice can be given be it crabs, fish or shrimp .... "always ask the supplier what water parameters they have in their tank." If that person is nice enough to replace them, I'm sure he/she would want you to succeed, and would help by giving you water parameters and tips.

To be honest I'd say if you keep cherry shrimp alive in a tank these guys should survive fine because they are at -least- as tough as cherry shrimp - if they don't then there's something weird going on.

Quick post now, longer one later, have like 5 mins haha My Amarinus Laevis live happily in a Fluval Spec 5 tank. It's massively over-filtered (biologically with aLift sponge and tons of seachem matrix in the built-in filter compartment, very high flow rate) with coarse mechanical filtering as well. P.h. ~7.5. TDS ~300-350 (although I am gradually lowering it). Haven't taken gh/kh reading recently but the water is pretty hard. Tank is planted to the max with moss, java fern, subwassertang, and a chaotic anubias that has spread it's roots all around a goldvine driftwood in the centre. Also plenty of cholla wood and alder cones. No Co2, no ferts, Up Aqua Shrimp soil that has lost buffering capability. Temp ~25-26C. Foodwise: Sinking blackworm pellets (1 per crab every 2-3 days) are their fave. They share barley straw, soy hulls, algae wafers (LFS special brew), kale powder, mulberry leaves, boss baby powder, etc, with the shrimp. Tank is FULL of biofilm and I leave plenty of algae growth. They sift through soil eating stuff, occasionally breaking apart the soil pellets for minerals, and eat ramshorn snails too (sparingly). On the advice of the guy I bought from, I just temperature acclimatised with no fatalities. As an experiment I put them in an unheated tank where I keep choc cherries and they did fine! They actually seem really tough so I think maybe it could be some kind of chemical they're sensitive to in your tank? Got any more info about the tank they died in?

If anyone is considering entering shrimp, the cut off to register is this Sunday. ? Interstate postal entries accepted, and shrimp entered can be auctioned on the day if you do not want them shipped back. For those who can attend on the day, there will be some stunning shrimp on auction, sensational sponsor special offers (lol), and just generally a great opportunity to catch up with other shrimp folk. Look forward to seeing some of you on the day!! ?