05-09-2011, 07:55 PM
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To the initial question, I would always have Malaysian Livebearing Snails in my tanks, planted or not [don't have non-plant tanks, but if for some inexplicable reason I ever did...
The pond snails are also good, but only the MLB (MTS) burrow throughout the substrate. This is very important to keep it loose so the water flow can be natural and the bacteria can do their job because of it.
Another plus for Malaysian snails is they do not care about water parameters. My tanks have zero hardness, and some a pH of 5, other around 6. These snails thrive.
As for the Java Moss, that is odd; I have hundreds, and I mean hundreds of these snails in each tank, and my JM on all the wood igrows like a weed. I would suspect another problem and the snails were just there eating the decaying plant bits which they do quite well.