Snail genocide

Yep, lots on the glass and rocks to feed off of.

 

stars are nocturnal, so you may not see him very often. I always try to place a little food like krill by my stars den to make sure it gets enough to eat!

I would bet it is the red hermits killing things...esp if the snails tipped over and was stranded on their shell, it gave the hermits a perfect opportunity to eat them

 

That would make sense. Poor little guys.

 

I would always accuse the big long and scary creature

 

I was going to suggest the snails might be climbing the glass in search for food and falling off the top, but you say you have plenty of algae on the rocks.

I hate righting snails so I always get the kind that can do it themselves.