In my 12g nano cube, I was using IO salt for the longest time. Everything was healthy, but I was keeping mostly LPS and softies, which werent as pleasant to the eye as SPS are. I wanted to see if I could grow all SPS in my cube. I started with a monti cap and it just did not look good. After reading, I decided it was because the IO did not have enough Ca/alk/mg to support it while doing weekly 5g WCs. I was not dosing anything either and did not want to get into dosing on a small tank. I decided on using a higher quality salt and chose RSCP and could not have been happier that I did. After the switch, I was growing not only montis, but acros. To sum it up, its a great salt.
My first few batches did not mix well and left a weird residue over everything. After researching, I found that the salt needs to be stirred around in the bucket before adding it to water (not sure why but it definatly helped). Also make sure you warm the water up before mixing and that there is a lot of flow in the bucket so the salt wont settle.