These (requires 2) fit my 25 year old Walmart 55 gallon fish tank. I had to cut a tiny notch in the plastic to get it fully in place. In my opinion they're about twice as expensive as they should be, but I wanted to keep the original setup and was willing to pay more for scarce parts. All of the aquarium equipment (top, lights, air pump, bottom gravel filter, side filter, fish tank, solid wood stand) was $99 when sold in 1995. All I added is gravel, water, plants and fish. . Nice to continue.
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