Crab Help!

[summat fishy]

hello everyone...rite i bought some red crabs yesterday and they are in my freshwater setup on their own and now ive just found out they are brackish...i dont have any aquarium salt but i do have some natural sea salt. is this ok? also how would i go applying it to the tank? thanks in advance summat fidhy

 

[newtotropical]

Dont think it is mate. Thats as much help as i can give!!! Try the inverts section.

 

[summat fishy]

lol didint think so thanks anyway mate!