Excellent, they just arrived.
Siva, I've got 6 MTS too. Some people say these are pests, some say they are useful for aerating the gravel and cleaning left overs. I'm a little concerned about adding them.
Well I don't want to suggest you do something that you might regret. All I can say is that, personally, I think they are great. I think they serve a good purpose in the tank but also are attractive. Maybe I am biased because I really love snails. I've heard they reproduce like crazy, but I've had them in my tanks at least twice as long as ramshorn snails and in the time 1 ramshorn has turned into 100, I've yet to see one MTS baby. And I recently did a substrate change, meticulously picking through the gravel removing any snails...no babies. I knew approx how many snails I had put in there and I counted and came up with the same. So I don't know what to think of their supposed rapid reproduction. It's not a risk for me because I really don't mind..I'll just sell them if I end up with too many