[Bernd Bussler]

The water values see not so bad, but the Ph value you still need to do something that is too high. It may be that are not fertilized by the non-optimal water conditions the eggs and are therefore no longer maintained by the male. Actually, it is not glue the eggs when the ms is too high in the bubble nest. But 83 ms should be no problem. How offt you doing water changes, could be the germ load is too high