diatoms and green stuff

cheets22

New Member
Hey-
I thought my tank had already cycled, I had diatoms that eventually went away when i put some snails in. now the diatoms are starting to come back. what do I do? furthermore, i have occasionally small kelly green spots on my sand, what is this? last thing... all my snails have died except one, how do you kepe snails alive?
 
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