Festivus vs Plants vs Snails?

I had heard that M. festivus were known to eat plants (there is too much info on the web sometimes, and here I am muddying the waters further...) but I have not found that to be the case in my very well-planted 150-gallon.

What I have found to be the case, and something I did not expect, is that the festivus is an avid hunter of snails. The ramshorns are having a very difficult time of it in this tank lately. I noticed the sand to be somewhat littered with empty shells, and thought the tank conditions to be less than optimal, causing a die-off, but after watching the tank for sustained periods I now see what is happening - the festivus hunts them down and eats them, snatching them right out of their shells. He employs the same technique that is used by my figure-8 puffer, with a slow approach and windup, then SLAM! right into the aperture for a meaty bite.

So, at least for this festivus in this particular tank, plants are safe, snails, not so much.