With temps rising I'm concerned about my shrimp tank getting up to 80 during the day when I'm not home. I've read a lot of info about ppl using fans for evaporative cooling. I see many ppl using computer case fans. My question is how do you hook these up and power them? They run on low voltage so do you have a power converter or something? Most of them have a red and black wire, how would I hook these up? I'm pretty good at building things and electronics, so if someone can help me with the basics about how to hook these up, I would be most appreciative. Would I spend about the same in just buying a premade clip on fan from walmart?