Thanks for the suggestions, but I don't think they'll tolerate the warmer waterThere are also Tanichthys albonubes or micagemma or linni that are very easy to maintain and more healthy than Cardinal tetras.
LOL Well, I'm not 100% committed to them. I'm just looking for all suggestions that will live well with a pair of GBRs and the associated water parameters.Was all going so well until you mentioned guppies.
My whiteclouds go outside in the summer. The temperature probably gets as low as 10 at night, but I wouldn't try to keep them above 24.@MammaBearinTN Tanichthys are tolerant to every thing : temp. 10 to 28°C.
Guppy, like many viviparouss, prefers a basic and hard water but without forgetting that we should never aim at extremes in terms of parameters.Guppies and rams are unlikely to both thrive as they have much different requirements. All the other fish you mentioned prefer softer water , except for guppies.
A friend of mine who lives in an area with very pronounced seasons has been keeping Tanichthys in his garden pond for years. There are between 250 and 300 Tanichthys as well as a dozen Goldfishes 'comet'. It freezes every winter and minimum 30°C in the shade in summer! That said, the pond is 150 cm deep which makes the winter less difficult to bear.My whiteclouds go outside in the summer. The temperature probably gets as low as 10 at night, but I wouldn't try to keep them above 24.