08-03-2007, 09:26 PM
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If the snails are fed enough to keep them happy they make a huge mess! I have 2 adult and 7 juvenile mystery snails in one tank and I have to remove more poo than in my fish tanks that are heavily planted and probably overstocked.
It is like any other snail though, if you don't overfeed the fish I doubt that the snail makes much more poo than a small sized fish like a danio or swordtail. Just remember, mystery snails need a higher pH to keep their shells healthy and need a lot of calcium in the water or high calcium food sources otherwise you will see shell erosion.