Oh My God... we got 2 assassin snails about 4 months ago, we now have about 10. We kept them all to sort out the problem snails, came into front room this morning and there's 6 assassin snails eating a tetra! So what do i do now? Should i get rid of some assassins? I'm guessing the tetra was maybe poorly? He seemed fine though, colourful and perky, swimming and eating fine, no unusual marks or splodges.. Sooooo weird.