04-02-2010, 02:49 PM
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the ones with round shells are probably ramshorns..
Some people say they bother plants, but I have about 15 largish ramshorns and 5-10 largish pond snails and I might lose 1 leaf from my rotala every few months.
I think benefits cover any drawbacks...
(heavily planted tank, some Guppy
fry might die, they'll eat the corpse so it doesn't pollute too bad.. also eat algae, etc.)
Also, something that small, unless you have several hundred probably couldn't do that much damage anyway.