Stefanie – very nice photos of the fry. I have observed my Paros showing interest in other Paro species in neighboring tanks. I have a series of 5 gallon (18 liter) tanks on a shelf housing 4 species. I was feeding BBS last week when I was interrupted by a telephone call. I had feed shrimp only to the first tank. When I returned I found the fish in the second tank all lined up at the glass adjacent to tank number one. Noticing this I went to the other end of the row and fed in the last tank. Sure enough Paros in the adjoining immediately came to the glass also. This seems to suggest that they pay close attention to activity in neighboring aquariums. If your tanks are in close proximity to each other it might be interesting to see if a relationship would continue through the glass between your pair of quindecim. Often a female betta are placed in a cylinder within a tank with a male to encourage the breeding process while protecting her from harm. I guess this is not much different than two tanks sitting side by side.