Yes I use the flora series 3 part nutrients and have for many, many years.

I have tried Advanced nutrients sensi pro series, it was very good. just not as good as they said. It takes away all of the control I like to have. I have heard great things about Dutch Masters new stuff but I have not tried it yet.

epsom salt is used in small amounts every other res change just to be safe.

Advanced Nutrients HyOx is not bad it process a little better and mixes a little better then just a tsp of epsom salt for 5 gallons.