Euphyllia [or any reef] stable parameters is the biggest key (I know that can feel like an overused term in reefing but it’s the biggest truth their is) There’s plenty of examples of happy torches, hammers, frogspawns, in every type of system from those running .2-.3 PO4 and 30-50 NO3 all the way down to “ULNS”. Let your system and maintenance routine find it’s sweet spot and run with it as long as everything’s looking happy.
Melafix Marine is my dip of choice for Euphyllia. It doesn’t seem to be nearly as harsh on the coral as others I’ve used over the years.
I have the Euphyllia Addiction too!