I have a 30 hex that has been setup for 2 months or so. Tonight I noticed 1 snail, then anther and another and so on. I was able to pick out 6 or so, and the other 2 went into the gravel after they fell out of my fingers, and is on the driftwood in a crevice.
I have noticed 1 of my Anubias Nana's leaves looked like it was being eaten. I found another snail on my other plants.
One looks like a spiral and is kinda transparent and small, the other looks a normal snail with a normal dark colored shell and is larger. I would take pics but the camera makes them look like dots.
Looks to be like Small Ramshorn and maybe Bladder snails. They are very small. The Ramshrn are about size of a pinhead, the other about 2 times larger.
How can I get rid of them, could they be the plant eaters? Are they bad?
You will get just as many people telling you how good snails are as ones that will tell you how destructive they are. I usually do not pass judgement until I observe with my own eyes as in this hobby that is the only way that you will weed through all the contradictory and conflicting information.
Based on my observations, snails can be destructive and will target healthy plants when there is little or no food(fish flakes, algae discs, algae, dead or decaying plant matter). I am not suggesting this applies to all snails. For instance, you cannot beat nerite and olive snails for algae control, but they do not reproduce in fresh water so will not get out of hand. Olive or Nerite snails are the only ones that I would put in my tank.
Here is what I have tried and what I have seen.
(1) Baiting snails with a piece of zucchini. You will do this never ending, It controls the population but does not stop the destruction.
(2) Siphoning them out with a Turkey Baster. Appears to work really well but you will have to do it persistently every time you see snails.
(3) Minimizing feeding. Does not work. They don't magically stop reproducing and disappear. Instead the snails will make a all you can eat buffet out of your healthy plants when they are deprived of other food and will still reproduce like rabbits. I tried this in a 3 gallon tank with healthy plants and that is what happened, to the point that I had to tear the tank down.
(4) Pre-treating plants with alum before putting them in. Snail eggs seem to survive the alum soak, snails will resurface, plants suffer from the dip and melt.
(5) Assassin Snails. I put one of these in a 5 gallon hex with snails and 5 gallon rectangular tank and I still have a snail problem after several months. Some people swear by assassin snails. I found that they did nothing even when starved of any other food. I observed the assassins gliding by the snails on the tank walls like the snails were invisible or did not even exist. Lol, some assassins.
About your best bet would be to get a clown loach, yo-yo loach, or chain dwarf loach as they will feed off the snails and keep them from destroying your plants.