[Manwithnofish]

Oh, I just cancelled a bid on ebay to purchase 25 (w/free shipping) because someone told me that they are simply marvelous, but the population very rapidly gets out of control. His statement was that 90% of his substrate was the snails. I got cold feet on that testimony.

As for the Over Filtration part, I'm having that very same discussion on another forum today. What seems to coming from it is, that maybe we should distinguish between filtration and water circulation (filters being use to circulate water but not filter it meaning changing it's chemistry). That perhaps what we put in the filters is more important than the number of filters or the flow rates, etc. It's a very interesting thread. I'm gonna use the Diana word here, but I injected that Diana Walstad (in her book) indicates that in a planted aquarium, perhaps you could be filtering nutrients that the plants either need or could benefit from. She does state as her point of view that you can "over filter" in some cases.