Hey,
Man, I use to have Turbo Snails in my big Reef/Fish and I couldn't agree more with mud. They should be called Rocket snails as they can blast algea/s ime.
I love the Blue Leg Hermits too, hardy and cool to scope. I've never had any Margarit snails so I can't comment from experience.
I would run a 8/16(or less) light schedule until your algea problem is under control.
If your running Tap water, fooget about it....usually phosphate city