ESV Salt and FOWLR Tanks

[aquatic mouse]

I would like to use one salt for all of my tanks. I plan to have it premixed in a barrel of RO for easy water changes.

I have a 55g reef tank,
20g Galaxea + Damsels tank, and a
180g FOWLR (Fish only w/ Live Rock) Tank.

I want to start using ESV salt.

Are there any reasons why shouldn't I use it for my FOWLR tank?

[marinelife]

It will not hurt your fish or anything it is just geared toward tanks with corals since it has higher Ca, Alk, Mag levels.
I understand the need to want to only mix one type of salt but I would not waste the good higher priced salt on a Fish only.
Instant Ocean or Kent would be cheaper.
You could get two mixing barrels and label each