I have had my saltwater aquarium for about 5 years and there has been a lot of experimenting with products. I have used different product but this product eliminates the frequent testing of your water.

This is nice since you dont have to worry about mixing powders. This is already premixed with mag and stront as well. So check your levels. My tank resently dropped horribly in cal, small amounts in mag, and no alk. So this worked really well for me. Read the directions and take it slow. Jumping ppm can be bad even if things are low. Water change Water change Water change. But if that isnt working and you need a bit more. This is the product for you. 2 negatives. 1)It is a bit pricy 2) there is nothing between 250ml and 2 liters. a nice 500ml-1L would work great. i have a 30 gal reef so a tiny bit goes a long way.