Hey Jerry,
I had the same problem with the Harlequins....they just disappeared one by one. I had 50 to start...they are too sensitive...
Cardinals are way better but after keeping them for 1 year now...I don't see the females getting berried anymore....
I have given up on the other Sulawesi species..hard to find a good shipper and they are way to sensitive...I have tried the yellow cheek, red orchid, white orchid, and harlequins...and given up...
Now if I can jsut get more Cardinals I would but they too are harder to get for me now...
Good luck to you