i recently purchased a wunderpus from a lfs. they had 2 and the other was sold already. i know this is highly not recommended. this is my forth octo. the tank in a 34g solana cube. he/she has only come out at night. as soon as the lights come out he comes to the glass. i haven't seen it eat yet. there is 2 emeralds, a peppermint shrimp and the CUC for it now. it's mantle is about 3/4-1 inch and its tentacles are 3-4 inches long. how can i tell if it's a male or female. any advice will be greatly appreciated. thanks!!!