7Enigma said:
I've said it before and I'll say it again, pond snails like any other species of snail will not become problematic if you keep the tank in good health. That means proper water changes, gravel vacs, and not overfeeding.
If that is so, I must be the exception...I have a 15 gallon tank that is overrun with tiny Planorbis sp snails, despite being filtered by dual AC50s (that is 400gph, with both filters stacked with sponges), getting a 75% water-change every 4 days, and being vacuumed (within reason, as it is fairly heavily planted). The loaches in the tank seem to keep 99% of the snails from reaching maturity, however, as mature specimens are rare at best.