Someone on here was talking about little snails that burrow in the sand....are these helpful for your tank and if so what benifits do they give and what kind of snail are they? Im going to sand in my 20gal. on mon day and have a (getting to be) heavily planted tank.......thanx in advance

im confused, you can just put 1 in and then it cant breed eh or do snails split in half or sumthin!!!!!
/www.thesnailstore.com/