When ordering a custom Walter Lid, the most important step is getting accurate measurements of your aquarium. Every tank brand and model can vary slightly, and a perfect fit ensures your lid sits securely, prevents escapes, and reduces evaporation. Here’s how to measure your aquarium like a pro.
Step 1: Measure the Inside Rim
Most aquariums have a plastic trim or rim around the top edge. Always measure the inside dimensions—the exact opening where the lid will sit. Using a tape measure, record the length (front to back) and the width (left to right) in inches or millimeters.
Step 2: Check for Filter Cutouts and Equipment
Do you use a hang-on-back filter, sponge filter, airline tubing, or lily pipes? Mark where these pieces sit on your tank, so we can add cutouts or feeding ports. This ensures your custom lid works seamlessly with your equipment.
Step 3: Account for Rimless vs. Rimmed Tanks
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Rimmed tanks: Measure the open glass space inside the rim. The lid will rest inside this area.
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Rimless tanks: Measure the full glass top. Polycarbonate lids can be cut to sit directly on rimless edges or with tabs for extra stability.
Step 4: Double-Check Your Measurements
Recheck your numbers to make sure they are exact. Even a 1/8” difference can affect the fit. At WalterLids, we precision-cut lids based on your measurements, so accuracy is key.
Step 5: Choose Your Features
Once you have your measurements, you can select add-ons:
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Feeding ports for easy access
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Hinges for larger tanks
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Cord cutouts for heaters, filters, and lights
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Black edging or handles for style and convenience
Why Custom Walter Lids Make the Difference
A well-fitted polycarbonate aquarium lid keeps your tank looking professional, prevents fish from jumping, and resists warping better than acrylic or glass alternatives. With a custom lid from WalterLids, you get a perfect fit for your specific tank—whether it’s a Fluval Flex, EVO, Spec, TopFin, Aqueon, or custom build.
Final Thoughts
Measuring your aquarium correctly is the first step toward getting a lid that protects your fish and enhances your setup. Take your time, write down the exact inside dimensions, and let us craft a custom Walter Lid that will last for years.