I have had a group in the past.
Very sensitive to nitrates, clean water is essential. They show much more aggression to others in the same group than domesticated ones, seems they establish a hierachy. Growth rate is very slow surprisingly.
I started out with 5 in a 80 gal with some discus. The tank was under the care of a friend for the summer with me visiting about once a week to service the tank (maybe like once every week and a half). The hot climate did make water parameters foul up faster. I believe temperatures were around the higher 80s. I recommend around 82. They were doing fine until i lost 2 when i didnt return for about 2 weeks. At the time, the only filter on there was a xp3. They also seem to really enjoy high oxygen levels.
For about 4 months they hardly grew in size. 2 of them started to get thin, and i didnt know what to attribute it to since i treated for parasites in the past. I quarantined them and medicated but coudent alleviate the problem and they wasted away in a matter of a month.
If you have any more questions feel free to ask!
Drowning