Please Help with my snails and corals

[kenman999]

I placed a poly pad in my filter for a week now. There is no colour change on it at all. No copper or heavy metals i suppose?

One of my friend told me that I don't need a canister filter in a reef tank. Should I remove mine?

I brought my water to a lfs again this week and it showed that my mg is 600. She checked it twice with two different test kit(elso and something else) but my cal and ak level r both steady. 420 and 8kh. I have added mag in hoping to bring it back up. My phosphate-0, copper-0, all other readings r perfect.

All snails and corals r dying in my tank in one/two days. What else can I do now. If there r something so toxic that can kill em in 2 days, why r my shrimps, fishes and hermit crabs doing so well?

Please help.

[whatcaneyedo]

What do you currently do for water changes? Were the coral and snails that you bought well established and healthy at the store? Overall how much flow do you have in your tank? Do you have a protein skimmer?

I'd remove the canister filter.

[kenman999]

I change 10% every week. I have a deltec mce300 as my skimmer. I have bought corals and snails from two different store which all look very healthy when in store. My friend also gave me some snails from his tank which were very heathly in his tank.