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I can tell you first hand that YES, they can/will reproduce in an aquarium. I purchased two from my LFS to control a pond snail outbreak in a 5g. I had them in there for two or three days and then gave them away when they 'did their job'. A few weeks later I pulled out 25 baby assassins and tossed them into a 46g. Now I am pulling assassins out daily, the number is up to almost 60. I still find babies here and there.

Although I do keep a single assassin snail in my 90g, as two are needed to reproduce. The lone assassin eats enough pond snails, (I find empty shells everywhere) but I am still pulling out pond snails in there daily. Controlling my pond snails is a PITA for me.
 
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