Apistos, like alot of fish, aren't nearly as fussy with their water conditions than many would have you believe. My water happens to be really soft out of the tap naturally, but most will be just fine as long as extremes are avoided. They do like caves, but that can be anything from pot shards, to coco huts, to holes and crevices in driftwood. Usually, stacking a couple pieces of driftwood will provide enough cover, and they will pick what they most want to use. Borelliis are also considered one of the easiest of the apistos to keep.