So we are suggesting everything from uaru to fronts but have no clue what the OP's hardness/pH etc are? Am I the only one who thinks this is an important thing to ask before recommending a stocklist?
Coming from the guy that kept every SA cichlid known to man in liquid rock Vancouver tap water? Yeah, I don't think it's a huge issue with most fish, especially if you're not buying wild fish and trying to breed them. Ph/kh is very easily raised if it happens to be low, as you've seen in my tanks.