Why dont you do an experiment with YOUR water kok fh. Let it live with crap water, crap food, tankmates etc and lets see how relying on your fishes superior genes works out for the poor thing. I prefer my fish thriving, I can see the pay off when my fish are able to express their superior genetics.
That isn't what we are arguing, the genetics work regardless. Its never anymore or less than the 90% to 10% ratio. By your logic, I wish I could call it logic.. The fish will surpass genetic limits because of the care given to it was at the optimal conditions. Isn't that correct? You said genetics will suffer because conditions aren't optimal so the reverse will be true would it not?