hey guys. so i just got my 55 set up. its currently at 8.o ph and 80 degrees. i have a rainbow that outgrew a 29 gallon and now im moving him to the 55. i also want to add 7 or 8 african cichlids to the mix. the problem is i dont know who gets along with who. any help picking fish would be great. preferably an all male tank also because i dont want breeding. finally, i saw a crawfish at my lfs. would it be safe with the cichlids and rainbow? would the cichlids and rainbow be safe? THANKS