I’ve got a 135 gallon tank with a Central American cichlids, however I’ve started to lose interest in the tank so I’m selling some of my stock to accommodate some catfish. I will be left with a group of thorichthys and a clouded archerfish. I wanted to know of some catfish that tolerate hard water as that is my tap water. I’ve already asked about Central American catfish for when I was going in that direction but there didn’t seem to be any that would work. I have started to plant my tank so they would need to be plant compatible. I’ve been reading a bit of stuff about how many fish go through changes in the ph and hardness of the water in the wild depending on the seasons and other factors. They say that stability would be more important in a closed environment than altering the water to try and mimic a fishes supposed natural habitat. If this is true then would most catfish work if they get along with other fish. My water is around 7.8 ph and pretty hard. Thanks for any help and suggestions.