I am getting an Electric blue crayfish about 2 inches big at the time of purchase. I have been searching for specific info but cannot find it. Also it is a bit confusing because I have found equal posts about whether a crayfish can be with fish or not. Some swear he will take them all out, some swear he will not be fast enough to catch them. Once again I am getting the Procambarus and not the Cherax as I understand there is a difference, my question is however the compatibility between them and Discus fish. Also if you have time feel free to comment on other prospective tankmates in a 40 gallon tank. Another albino crayfish (just 1), possibly not all, don't want you to think I am crowding: mollies, african dwarf frogs,japonica or amano shrimp... Just want to know how they are with blue crayfish, I want him the most! Just got a tank for free from mom so I saved about $500 for the setup, any answers appreciated!