I have a 20g tall Top Fin tank. I also have a lot of floating plants. The problem is the hood design, it directs light downward for the middle 1/3 of the tank while the front and rear 1/3 get next to nothing. I need something that gives light across the total surface area. I'm on a tight budget so I'm looking for a way to fix this cheaply. A new hood? A double fixture hood? A homemade hood? Any ideas?