luckily, petsmart honors their online pricing for io, $32 per bucket.
btw, i was given a few boxes of tropic marin, and the texture of the salt is so different from the IO and coralife. it seems far softer, more like powdered sugar than the others, which feel more like table salt.
wonder what the impact is chemically?
anyone have a link to a fact table with all the salts freshly mixed and tested?