bubble nest becomes one big bubble?

I have never heard of this. Is he in view of the female? It could be that he is just ignoring the bubble nest and it goes into one big bubble. I always just see the nest disappear slowly with bubbles popping.

Though about the AQ. salt,I wouldnt put this in the tank while breeding.

wow strange, i really don't know what to do about that o-o it sounds so strange never heard such a thing, do you have an active filter or anything that blows bubbles in the tank?

No, just standing water. One thing I should have mentioned; it's into a styrofoam cup bottom. Instead of a nest, it forms one big bubble. After reading the way I wrote it I pictured a large free floating bubble.