Stage II of watching a process unfold:
Henry (my betta), didn't show much interest in my black nerite. First two weeks the nerite moved around the 10 gallon at will. He then began hiding in the driftwood, not seen much. I didn't think much of it and bought nerite 2/tiger nerite.
Put him in the tank at night and the exact spot he was before I went to bed was the same in the morning with Henry glued to him.
Henry had tore his fin on something so I opted to take things out of the tank and put Henry in a separate tank.
Rearranged the 10 gallon with only plants and a few polished rocks.
Henry was out of the tank for 5 days. Nerite was doing a wonderful job with diatoms/algae.
I put Henry in again and he was relentless. Finally, he looked like he grabbed the snail and shook it, then head butting while it was on the ground.
No worries, I got the nerite out.
Henry did not show this behavior with the black nerite, but the tiger was a different story.
I just purchased a tank divider and my plan is to put the snails on one side, then when they run low on food to switch with Henry.
I definitely will not trust Henry with any other tank mate at this time. For some reason the red tiger really triggered Henry.