Originally Posted by
dagray
when you introduce plants you risk bringing pond snails into your aquarium. This can be good, and it can be bad as follows:
Good: food source for discus, angels, other fish. clean some types of algae if you have an algae problem.
Bad: can eat plants, can overrun your tank and even if there are too many kill slow moving fish (think sucking slime coat off of sleeping discus).
Snails can be an indicator of overfeeding as a snail population explosion tells you that you are overfeeding, but if you only have a dozen or so snails you are probably okay.
A way to prevent snails is a dip in bleach water or other chemical dilutions.
Plants that are good for beginners are the swords, annubias, water lettuce, floating red root, valisnaria.
There are other plants that are easy, but they don't come to my mind directly.