Thanks, My problem is I have one big plate of glass with the front 6 inches hinged to open and feed. My WC includes removing the entire top and getting distracted cleaning skimmer cups or whatever lol. I'm just paranoid especially with a tank full of Olympic jumpers. Or maybe just looking for a reason to stop doing it lolYou can still vacuum and probably need too for excess detritus. I have 3 glass lids and just open one at a time rather than removing. Once my cleaner wrasse jumped up onto the glass (and several times into my hand) and just put him back. As long as your there and cleaning I don't see a problem. It's not like you're leaving the lid open for days where anyone could jump, not just wrasses.