blue crawfish

Hello All,  I need help with some tank mate ideas, at this point I feel like I'm playing Tetris and I really don't know where to go from here! I have a 40gal with an EBJD & Blue Cray (both bought 2 months ago)..... I got a 72x18x24 125Gal tank that isn't set up yet (should have it going by May)...