i wouldnt try bbg's with red clawed crabs, also i hope you know that your crabs need more land than water so even if you did get some bbg's there wouldnt be enough water in a ten gallon tank for them.
"10 US GAL (CRAB TANK):
1 Female Betta (Paladin), 3 Red-Claw Crabs"
do you know that these crabs are brackish? bettas are not. And im guessing since you have a female betta in there you do not have enough land for the crabs and/or enough water for the betta