well - I think I have babies! They are just resting on top of the leaves around the nest, don't appear to be able to swim, and he is still actively blowing bubbles into the nest. Not sure how much longer to leave him there for (it is 48hrs post spawning), don't want them to get eaten?
They are so TINY, I wonder now if there were some babies first time they spawned but I just couldn't see them. Was also expecting them to be wriggling/vibrating like the apisto babies did when they were first hatched/before free swimming. These could easily pass for BBA fragments!
FYI the nest looked broken up yesterday evening (@ 24hrs post spawn), but I couldn't see any babies tho thought I saw a couple of eggs. By this morning he had re-blown the nest. So nest breaking up may not be a great indicator after all, as looking at it now its perfect but they have hatched :dunno:
Soooo not infertile then, good news for yours I wish I could take a photo but too small for my crappy camera.