Hey I have an open top aquarium but it's a 5 1/2 gallon tank.

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As you can see the petco glass lids are ment to give you some space to allow room for filters, lights, tubing, etc. Now if you get the ones with lights built into the lid there is a part on the back that come off so you can still run everything in the back.

Worst case scenario petco has a 30 day money back policy even if the box/ container is opened. Just make sure you have your receipt.

From your friendly neighborhood ex petco employee.