Snails are good, every tank I have has snails. BUT THEY ARE IDENTIFIED!!!!!!!!!!!! My disaster in 1995 was when I bought more plants to add to my already well planted tank. I had hitch hikers, pond snails and ramshorn snails. These snails DONT need food, they devoured my plants and multiplied like the national debt!!!!! Hundreds of dollars worth down the drain. If you want to keep snails you are best off with trumpet snails, rarely do they eat plants and only multiply if there is ample food. Second choice is the apple snail, they eat some plants though so be careful. Snails are awesome, don't get me wrong on that fact. The fact I am trying to get across is that some snails can be pests and not pets. Snails come in different types, just like fish come in different types. When they say snails are good and do not tell you what snail they know are good is like saying a fish is good for your tank so you go buy a random fish (oscar) and put it with your guppies because fish are good. Disaster RIGHT!!!! Snails are not good for your planted tank either, many eat plants like the ramshorn and the pond snail. Trumpet snails on the other hand are great for planted tanks. Just saying snails are good for tanks is WAY BAD ADVICE if you do not tell them what snail is right for a tank type. Its like saying fish are good for tanks filled with water. The right snail for your tank will be awesome, the wrong snail can be an overwhelming burden. That is why I said if you are unsure of the ID of the snail you should eradicate it to ensure you do not have any problems.