I have 60+ assassins in my 10 gallon, have never seen them go after each other at all. I didn't even feed mine snails for months and still no dead assassins in my tank. Perhaps the holes in the shells are caused by your water?Yeah I'm not sure what to do. I have tons of snails in my tank but the assassin have only tried to kill each other. They have drilled holes in each other's shells.
I think you need a lot more than two. I'd guess 6-10.I also have about 30,000,000 snails (could be 30 billion, who can count that high). They come up out of the gravel at night, when the world is asleep. Thought they were "cute" when there were 10, got a Clown Loach when there were 10,000, got 2 assassin snails when there were 20,000,000. It's like fighting the zombie horde with a BB gun ..... sigh.
They are freakin' everywhere (most of the white specks are little snails). I even have little babies floating around on top of the water.
Are assassin snails the best method of control? If so, I guess I better get a bunch more AS's.
Also, I am getting ready to set up my next tank and WAS going to take cuttings from my infested 30. Is there a way to kill off the snails B4 transferring?