Regarding the white cotton stuff on your fish..I think it is fungus. I'm not very sure the effectiveness of salt on fungus but may ask some other experts like "Salt King" <---DEA...or find medication that states that it will not harm plants. Try not to remove the sick fish as it will stress it to death since it is already in a weaken state. As for the snails...best is you remove it by hand to reduce the population as much as possible. The thought of re-introducing puffer fish is tempting but may be disastrous as it might just pick on your already sick fish instead of the snail. Heard that Rams have know to pick on snails but mine never touch them at all..
Plant Physiology by Taiz and Zeiger
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