Piotr K.
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First of all, do some more runs of the same setup. There are many possibilities to get the outcome “no fry” – 1. The females are not producing eggs 2. The males are not good, so the eggs are not fertilized 3. The eggs were eaten by the parents or by other fish. 4. The fry was eaten by adult fish 5. The eggs were fertilized and developing, but died at some point because of, say, lack of oxygen in the spawning mop… etc etc etc. Only after doing several runs of the same setup you will be able to tell something about the real number of fries you can get. Running just once, and then changing something, makes impossible to tell if the outcome is “true”, or if it was just a result of pure chance. This is why I set up so many tanks, and I will be testing at least two times, if not more. Only such approach allows to separate the reality from the chance
(especially in case of these little bastards 
)Well, the fish don’t evolve so fast that data which are few years old are not relevant anymore
Anyway, at the moment I have 18 tanks (6 aquariums, 12 plastic containers) with various combinations of F/M ratio, substrate (fine sand, fine gravel, somewhat coarse gravel) and spawning media (moss and mops), to test what works good and what works less effective. Will let you guys know I think you can forget about him, mines never recovered from that state. They eat and grow, but after a while the energy consumption needed for constant swimming is too high, and they start getting thinner and thinner, and eventually become too weak to swim. The best way is to euthanize them as soon as possible
