Glass hood vs Plastic...
 

I am thinking about replaceing the hoods on my 20 gallon long and 55 gallon tanks with glass hoods because the corners/sides of the tanks do not get enough light to my liking especially the 20 gallon long. I was just wondering if anyone has done this and not liked it. Also if anyone has any super easy DIY plans I would love for you to share them with me.

You could get plexi-glass and just use door hinges... just a quick thought.

I thought about that but the screws would stick through the plastic and I don't have any thing I could cut them off with. But then again my dad probably has something I could use at his house so thats one idea. But on the 55 how would I keep it from bending under the weight of the lights? Maybe a thin piece of wood in the middle?

I like glass lids alot, but the plastic hinges tend to fail on them eventually. Its kinda annoying:-?.

You have a tank hood made for the tank with the fixture now, so the fixture is not full length; this is what my 33g has. On anything larger (more than 3 feet) I use a glass cover and a separate fixture. The glass cover sets are not expensive, they come for the tank size (length and width must be standard, width less critical as the construction allows overlap, but not for the length). There are plastic "rails" for the sides and across the middle, and the glass panes fit in these so they slide forward and backward, good for feeding. Then a new light fixture, they will sit on the tank frame and not on the glass. The glass will bow down just with its own weight, but turning over the centre rail piece every week during the water change will prevents this.