This is exactly the reason why we condition the fish- the poor males go through quite the ordeal. Just as Lebron said, there isn't anything you can do. If he's a first time breeder, he may just need to figure out how to properly wedge the fry into the nest enough to keep them afloat. I had a first time male who would gather all of the fry into his mouth (an amazing amount, might I add,) and he'd literally go "PUH!" and spit them at the nest, hoping they'd somehow magically stay put. Of course, they'd all just swirl around, then slowly sink to the bottom. After a minute or so of staring at them like this (-_-) he'd repeat the process over again. Needless to say, he was completely drained of energy when the fry reached free swimming.
The fry will be okay on the bottom, so long as he doesn't give up scooping them into his mouth and bringing them to the surface. At the same time he cleans them, keeping fungus from forming on them. I recommend adding indian almond leaves to the tank, as they benefit both fry and dad.