Spawning make Paros even in low water but it does not develop into larvae thus there are no pups, ornaticauda is there a very good example, they lay eggs at pH 6, but there are no larvae.
Bernd and Davy,
My ornaticauda do have fry actually. I’ve discovered them two weeks ago! The pH of their tankwater has never been underneath 6,3. Conductivity around 50. According the species page, this isn’t exceptional.
So I fully agree and confirm Bernds previous posting, expressing that the pH is an overrated parameter.
To get on topic again: I use peat fibers as ground layer. Paros of all ages love to hide under it.