I recently bought and set up a 150 gallon. It didn’t come with any lids. So I’ve been using Rubbermaid tote lids and towels lol. I went to the glass store and got 4 pieces along with those marineland hinges that snap onto the glass. So the question is, is it bad to have basically the entire opening of the tank covered? The only gap is about 3/4” strip that runs along the entire tank (minus the center brace) in the back where the filters go into the tank. There’s also small gaps where the hinges raise the glass in the middle but those are pretty tiny. There is a powerhead blowing oxygen into the tank. I’m just curious about oxygen exchange and whatnot.