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i wanted to get plants for my 20 gal tank and i wanted to hear what people think about the plants that come in tubes. it says they are snail free. petsmart sells them
98% of those plants are not aquatic. The only two exceptions are Anubias and Amazon sword, but they take a little while to transition, and they're priced very high IMO.
Agreed with rook. Do some more research on plants and their requirements, and then consider buying from a reputable Lfs or online. Aquabid.com and forsythaquatics.com have some great low light plants for reasonable prices.
Avoid the tubes and know what you are buying before purchase. Checkout http://www.plantgeek.net . They have a great list of plants that are commonly sold as aquatic but will not survive submerged in your tank.