I’m having a baby assassins snail problem! About a year ago I placed three assassins nails in my 40 gallon tank to get rid of some ponds nails that came with live plants. They took care of the problem and I removed them and place them in another tank. In the 40 gallon tank I have a very large mystery snail that I plan to keep and a handful of babies left that are being given away. The problem is that a year later baby assassinsnails nails keep showing up in my tank and I quickly remove them when I see them. I was very sad to see that my large mystery snail was dead this morning with a tiny assassins nail just inside her shell. Is there a way to keep the mystery snails but remove the assassins nails without completely changing all the gravel in the tank. I feel like that’s my only option.