Won't water ph really only matter when it comes to wild fish I mean if you have 3rd 4th etc captive bred fish I would think the need kinda breeds out of them and wouldn't a steady 7.2 ph be more important than a ph that jumps around ?
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Correct. the whole param argument works well for WC fish but the healthiest surroundings for a captive bred fish are the same params that the breeding facility used.
Also I have seen frontosa and Aro together many times.
There is a huge L shaped tank at an LFS in my city, they have a really old big Asian Aro maybe 3 feet long, two huge frontosa, a redhead cichlid, some monster clown loaches, a giant KKP etc fish have been together for years