07-06-2012, 01:54 PM
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I would expect the pH to lower in an established aquarium, considering the KH is that low. Is there anything targeting the pH in the tank, such as calcareous rock or sand/gravel?
Most of the Apistogramma will be wild caught, and attention must be paid to their extreme water parameter requirements. This varies with each species, though most are very soft and acidic water fish. Your GH is fine, if you can get the pH acidic.
Apistogramma cacatuoides is often available and may be tank-raised. This species is more adaptable to basic water. You can read more about it in our profiles, click the shaded name. It is the only Apisto species in the profiles so far, simply because it is the most commonly-seen and most adaptable.
Now some general comments on any of these. They do best with dither fish, meaning fish such as characins (tetra, pencilfish, hatchetfish) that will be in a shoal or group. Apistogramma are very shy, and without dither fish in the tank they may remain in hiding, or be stressed. Angelfish are fine, though I would still consider some shoaling characins--but here you need to pay particular attention to them being suitable for angelfish. I won't go into all that, but our profile for the Scalare Angelfish mentions some tankmates.
Second, they will spawn, regularly. And when they do, in spite of their diminutive size, the females in particular can be quite nasty when protecting their eggs or shoal of fry. They often take a strong dislike to specific fish, and this can lead to considerable stress. Catfish are particularly targeted. And here, another issue comes up: if you want the fry to survive, do not have any catfish (corys, pleco, etc) in the tank, as being nocturnal they will always get the fry if not the eggs. A few may sometimes survive, but not many or often.