FISH die in a tank that had hurment crabs in it ever seance nothing will live in it?

Answer 1

This is strange, did your crabs die from a disease?
what symptoms do your fish have before they die.
Have you recently just set your tank up again and it may not be cycled yet this causing death if you put to many fish in.

Please give more info.

Answer 2

check your water parameters
it sounds like your ammonia levels are way off chart, they're suppose to be at "0"
If they're not, do a 50% partial waterchange right away, and keep doing 25% waterchanges until there is no ammonia present anymore

Also when you get fish again, keep up with parital waterchanges of 25% weekly with a gravel siphon


Hope that helps
Good luck


EB