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[all_or_nothin]

i had crawdads for a cleanup crew in my 20g. i also had a baby senegal bicher that was an inch and a half bigger than the crawdad, but the crawdad(s) kill the senegal even though it was bigger. the senegals chest was split wide open. so...
1.) even tho your fish might be bigger, be careful, or dont even risk it.
2.) crawdads make good puffer fish food
3.) if ur fish dont eat them first... then they will most likely eat your fish

 

[1badspilo]

Break their claws off(yes it is mean) or rubberband them and the problem is solved.

 

[all_or_nothin]

i broke one off of the big one so he could atleast defend himself

 

[Lupin]

In the first place, you shouldn't have attempted the crayfish with your fish. A quick research should reveal it does not work.