I have been in the hobby for 17 yrs and experimented with several salt mixes. Since last year, I have gone back to reef crystals and I am a die hard fan now. Because of their scale, they have Good quality control and low cost. Also, their 200 gallon boxes come with four 50 gallon bags. It makes it very convenient to mix in my 50 gallon drum. Mind you, the 50 gallon bag only makes around 42 gallon 35 ppt salt mix.
one added benefit for you is that it has high alkalinity, so for soft coral reef tank, you might not need to dose calcium or carbonate…
I regularly wait for deals on reef crystal on chewy or Amazon and order in bulk.
hope that was helpful.
Sam