Sorry I wasn't to detailed before. You have a lot of options. I wouldn't go cutting the back of that tank given the price of it . I used a LED light bar, there are some submersible options, some pond lights...though they generate heat, maybe you can even find a little florescent light that is water tight. There are a number of forums you can check out, here and outside, nano-reef.com is one. I was thinking that nano forums will have solutions that will also work in your all in one tank.