Only a short answer, because I’m at work. PH was 6,2 very high. I’m in contact with an specialist in protozoon. He may give me some informations. Knut:-)
Yes Helene. Not always the parents of our Paros are the problem that the eggs or also larvae will not develop. A lot off other things can occur to them. Planaria, Saprolegnia or Infusoria e.g.
(Planaria is always a problem, you don´t see)!
Knut