Only Mg and Ca are in the water, nothing else. Really good water in this area!Do you know what's in your tap water as far as nutrients go?
Tank is looking great by the way, I love the yoyo loach antics, surprised you have any snails left at all with them.
The YoYo loaches are young and small, and they have only been in the tank a couple or so months now. They do good work on the small snails, but I try to cherry pick the larger ones out.