Well, you could set up a mesh cover and then have your light up above the mesh. Or you could get creative and cut some wood to be bigger than the top of the tank, with the needed holes of course, and then cut holes in the middle, then cover those holes with clear plastic of some sort, and then situate the plastic lid you have to sit on top of the wood and put the lights in the plastic part, and voilà! You have a new lid! (I am only fifteen and these were just some ideas that I came up with, but I do hope they help you out) oh and I just had another idea! But it WILL definitely cost money, but I think it'll look cool and give you bragging rights! If you go buy that foamy stuff, the clay stuff that dries as a lightweight almost styrofoam stuff, and make that to fit the top of your tank and leave a space for lights, then, this is the important part, the clay stuff will most likely be poisonous to your fishy friends because evaporation will drop back into the water! You need polymer baking clay, and you need to first fit it to the shape of the styrofoam stuff, and then bake it. Last step: cut the holes for lights and other tank items and get a plastic cover for the lights to avoid electrocution! Did I help? ^^