Coralife Aqua Chill

[Aquattro]

Mark, ideally you should throw the glass tops in the trash. They keep heat in and the light out. Also, one of the best cooling options is evaporation, although that gets toughto manage if you're gone for 4 weeks.
You need to get a sump, an overflow, a flaot valve for your new top of system, and you'll be all set!