Should I use semi-hydro?

[Theodoreorchidking]

Hi there. I'm new and I have some questions. First I have some rothschildianum crosses, paph lowii, phrag kovachii, phrag longifolium, phrag humboldtii, and similar ones. I have a problem with root rot, give them to much attention, and have trouble getting the potting medium just right. I bought some leca semi hydro balls and wanted to try some or all of these. Will this work and what can I do to maximize success. Also with these they say to use ro water but I just want to use tap water: will this be fine? Thanks