What is a necessary aquarium supplement?

[alexhoye3]

Let me know the most important supplements for saltwater tanks.

Fishandcoralstore.com

 

[Tahoe61]

Too many variables involved.

Depending on salt mix, water changes, corals kept.
You need to test to determine your tanks utilization.
Typically you're testing Alkalinity, Calcium, and Magnesium, with many hobbyist monitoring pH.

 

[Terry Le]

I would not dose anything if you can’t test

 

[ZoWhat]

top off water