Great looking pictures. Glad they're adjusting to the tank well. When are the CRS coming? And yea, it's MUCH harder to tell which tigers I have are male/female. I still am only sure I have 2 females, and at least one male that knocked them up haha. No idea what the others are. Just happy they're all alive and well!
Also, what are the parameters of your tank? Will you be doing water changes with RO water?
And poor cat... neutering :X!