New unoppened fit for innovative marine lagoon 25. If your tank is smaller you can take the rubber out and it will come apart and you can use it same as the innovative marine kits, then just clip it back together. Has tabs byilt into the corners. I love the one I have on my wayerbox(same type). Up to tanks 23"x15.75"(measured inside the glass) $10 obo la mesa test 6517282623

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