How many kinds of zeolites are there? Guys, if you carefully go to collect information, you will go crazy, some wikis say more than 0 species, some say more than 50 species, some say more than 80 species. However, there are only three common types in the aquarium market, and generally speaking, these zeolites are white, green & pink blocks. But with so many varieties, which one is the best to use to choose?