I'll try to cover your multiple questions. First, depending on the type of crayfish you may be able to house them with fish. I have approximately 12
Well when crayfish mate the males places a sperm package on the female tail swimmers. My guess is the female has not ovulated and the packet is breaking
I agree with the above. If you have a planted tank only CPO and Dwarfs will leave most plants alone. I keep my crayfish well fed and they still try
What livestock, if any, are still available?
A betta will hunt any worm down. BUT it'd be good to know what you are dealing with before sicking a fish on it. If it's a tape worm, it could wreck your