I am afraid the spawning this time is what you could consider ‘not so successfull’ – I have experienced the same situation as you some times, – where the eggs does not stick to the ceiling, – and these eggs will not develop. They will most likely be gone by tomorrow. The male was trying to either get them to sit at the ceiling, or indeed he could have been eating them.
What happens is quite ‘normal’. The spawning is not succesfull when the eggs lye at the ground, so the parent fish give it up after a little bit, and they then eat the eggs. The nutritional value of the eggs is then preserved in the fish, meaning its not wasted. And the fish will produce eggs again.
If you have another tank I would definitely say you should get the male and female paro in that, – they will spawn again shortly after, – and there a much bigger chance of success then, also for the eggs to actually develop. And say you got the eggs to develop, and wanted to feed small fish 🙂 .. I will tell you the paro offspring is so small you have – in a bigger tank – no chance of feeding them. Or rather you cannot find them and they cannot find the food.
The food you need for these small ones is not artemia nauplia thats too big. You need some kind of infusoria, or vineager eels.
In a small tank its much easier to induce a milieu which support infusoria growth, and its easier to ‘target’ the small fish.
But you dont see them. I have just yesterday discovered that one of my parvulus pairs had offspring, – they are at least a couple of months old and I have not seen them before now. And trust me, I have been checking the tank with a flash light often enough. But you simply dont see them.