Hi everyone! I have a 120 gallon aquarium that was being used for saltwater fish. I’m getting out of that hobby so I drained the enclosure and clean it. I plan on putting my 4 foot Cali king in it. My only problem is a lid. The tank has two support bars and had three glass lids to keep the moray eel inside it. Obviously I can’t use those. Is there anyone who makes lid for a tank that size? Or is DIY the better way to go. Looking for suggestions and recommendations. Thanks!
EDIT: Dimensions are 72 1/2 long 18 1/2 wide. Forgot to add these lmao
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You could look online to see if there’s a screen top with those dimensions you could buy.
If not, you might try going to a home improvement store and seeing if they could cut a piece of PVC or plexiglass in the size you need. Then you could drill or burn ventilation holes in it.
Of course, if you have the tools and DYI skills, you can skip the home improvement store and just make something yourself. 
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You could lay the tank on its side and use the plastic door track and make sliding doors for the opening. Use 1/4" Polycarbonate to make the two doors and drill a few small holes in them for air vents.
https://www.amazon.com/Plastic-Sliding-Panels-Outwater-Plastics/dp/B08SHV4V71
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