08-21-2012, 11:47 PM
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I like both snails but they do 2 completely different things. I love my mts I keep them in all my planted and sand tanks they keep the sand/bottom aerated eat dead or decaying plants/food and algae I think they are a great addition to any tank. The assassins are fun to watch but in less your trying to rid your tank of snails I don't see much benefit to your aquarium from them. Mts actually benefit your aquarium, also if you don't have a large snail population you will end up having to buy snails for the assassins.