I have a good number of self-cloning Marble Crayfish for sale. $6 ea., 2-4 $5 ea. 5 or more $3 ea.
I have crayfish in almost all of my (40) tanks and have for years. The marbles don't really mess with the fish unless starving or the fish is dying and on the bottom. My breeder Swordtails, Platys and Molly feast on the small crayfish but some always manage to make it.
I also have small Blue Alleni Crayfish $10 ea, $7 ea. for 4 or more.
I have crayfish in almost all of my (40) tanks and have for years. The marbles don't really mess with the fish unless starving or the fish is dying and on the bottom. My breeder Swordtails, Platys and Molly feast on the small crayfish but some always manage to make it.
I also have small Blue Alleni Crayfish $10 ea, $7 ea. for 4 or more.