So today I threw a tums in my tank with all my purple mystery snails, as I've read and been told it helps them strengthen their shells with the calcium it provide. A few hours later and I can't see it anymore. I was just wondering if anyone else feeds these and how often they do it? I have a crapload of these snails, and I'm not sure how often I should add tums, or if every snail was able to grab a bite or not. I also have porthole cats and bristlenose plecos that are the other main bottom feeders, does anyone know if these guys eat the tums, or if its harmful to them or not? Do shrimp like tums?