measure the top of your tank and head to a glass shop, I had mine made for 30 dollars and thats because he only had 1/4 inch glass, for tops you only really need 3/16's. then you lay the two pieces side by side and silicone across the top of the seam, smear the silicone down a little with a wet finger and let it dry. Then all you need any small piece of angled plastic you could use as a handle and double side tape and your all done brand new lids for around 20-30 dollars. Hope this helps.