Hey man, nice seeing you again. Like I said, the best thing would be to get an algae scraper and mag float. I have a kit that comes with an algae blade, bristle pad, and scooper for the larger crap and debri. I don't have a problem with algae on my glass. Also, high water flow using power heads cuts down on a whole lot of algae problems. Puffers eat inverts. That's what those monster beaks are for, to crush the shells. You can't stop him from doing it you just have to work around it.