11-21-2011, 02:26 PM
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If the plants are from a tank with fish, there is the same risk as with new fish that they may introduce parasites and disease. As with fish, the best procedure for this is a quarantine period of 3 weeks in a non-fish tank. Make sure there is adequate light, temperature, etc. I use a comprehensive liquid fertilizer to ensure all essential nutrients are available.
I do not recommend any treatments beyond the above QT. Any such treatment that is strong enough to kill algae, snails, parasites, etc. will probably be detrimental to the plants, and perhaps kill them outright. As for snails, they are in my view a useful helper in fish tanks.