Just sell the NTTs together, but at a separate time from the IT. You put too many restrictions that makes it so hard to sell your fish. I don't think fish get emotionally attached to other fish the way we owners get attached to fish.
Hopefully I won't offend anyone here. If it seems like it is a ridiculous request to have buyers come pickup up at the same time because I don't want to take two different timeslots to deal with it ( at parents house, need to move cars out of the driveway etc.) then I would say, it is even more ridiculous that a buyer is basing his decision on pick up time (that's the only "restriction" right now) . I would be more than happy to arrange a good time for anyone to pickup, except it will just require a little coordination on my part with the other buyer (not even your problem to worry about ...) . With that said, if anyone is interested , please feel free to offer ( and let me worry about other things like pickup time later) .