Hi Juan,
You have a point. I have a breeders mind set and I sometimes forget to consider that most aquarists keep their fish to enjoy rather than to breed.
I probably would have been more correct to have said that very low pH, conductivity, and warm clean water are the best way to keep P. altums if one one has hopes to breed them.
I know better, than to imply they can't be kept in less extreme water conditions. I have done that myself, and I should have been more specific in my post.
The real trick is to get healthy alums to begin with. The majority of the altums sold are in very poor condition and to have much hope of bringing them back from the brink of imminent death often does require the low pH, almost straight RO water and warm temps.
Once acclimated they are easier to keep but they really are far more demanding than P. scalare or P. dumerlii.
Breeding P. altum is a central goal of the TASG on
www.finarama.com and admittedly there are some strong opinions on this topic. The present consensus built on an increasingly accurate understanding of P. altum and their biotopes does result in what seems like a bunch of " do it my way or hit the highway" sense of opnion. Both the hopes of captive breeding of P. altum and the Heckel discus are sometimes contentious subjects accompanied with emotions that run high. There isn't much middle of the road thinking as the camps are strongly divided between those who feel neither fish has been rarely bred to those who feel it is not that rare.
There is a lot of need for more documentation to support either point of view.
Most importantly and fundamentally, we just need to see more results from actually breeding them. At this time both fish are much harder to breed than the other species in their respective genera.
Larry Waybright
Larry Waybright