If you are in search of Coraline, then you will need to know what your MG is.
Pick up one, cheap enough , easy enough to use. I use the Read Sea and reads about 1450.
It is not wise to keep adding stuff without knowing your numbers.
Personally, I never got coraline before I got off the Instant Ocean and switched to the Red Sea salt mix. Purple up help jump start it as well, but I supect it was more the iodine aditions than anything. Good idea to test for the iodine as well if you are adding.
Cpuple of good links.
REEF AQUARIUM CORALLINE ALGAE PROPAGATION How to Grow Coralline Algae in a Saltwater Aquarium
\good luck
