MasterLids — Custom Aquarium Lids
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Reef tank with clownfish and custom MasterLids polycarbonate lid

Your Reef Deserves
A Perfect Lid.

Precision-cut to order, made in the USA, and guaranteed to fit — or we make it right.

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Red Sea aquarium brand logoWaterbox aquarium brand logoInnovative Marine aquarium brand logoFluval aquarium brand logoFiji Cube aquarium brand logoJBJ aquarium brand logoIceCap aquarium brand logoReef Casa aquarium brand logoCADE Aquariums aquarium brand logoAQUATOP aquarium brand logoUltum Nature Systems aquarium brand logoLanden aquarium brand logoADA aquarium brand logoLifegard aquarium brand logoTideline aquarium brand logoCobalt Aquatics aquarium brand logoAquaMaxx aquarium brand logoHelloReef aquarium brand logoEshopps aquarium brand logoNYOS aquarium brand logoAquaforest aquarium brand logoNeptunian Cube aquarium brand logoHydra Aquatics aquarium brand logoSea Cardinal aquarium brand logoSC Aquariums aquarium brand logoSR Aquaristik aquarium brand logoWIO aquarium brand logoFzone aquarium brand logoMaxspect aquarium brand logoAqua Japan aquarium brand logoReef Octopus aquarium brand logo
CustomRed Sea aquarium brand logoWaterbox aquarium brand logoInnovative Marine aquarium brand logoFluval aquarium brand logoFiji Cube aquarium brand logoJBJ aquarium brand logoIceCap aquarium brand logoReef Casa aquarium brand logoCADE Aquariums aquarium brand logoAQUATOP aquarium brand logoUltum Nature Systems aquarium brand logoLanden aquarium brand logoADA aquarium brand logoLifegard aquarium brand logoTideline aquarium brand logoCobalt Aquatics aquarium brand logoAquaMaxx aquarium brand logoHelloReef aquarium brand logoEshopps aquarium brand logoNYOS aquarium brand logoAquaforest aquarium brand logoNeptunian Cube aquarium brand logoHydra Aquatics aquarium brand logoSea Cardinal aquarium brand logoSC Aquariums aquarium brand logoSR Aquaristik aquarium brand logoWIO aquarium brand logoFzone aquarium brand logoMaxspect aquarium brand logoAqua Japan aquarium brand logoReef Octopus aquarium brand logo
Custom
Fully Configurable

Don't see your tank?
Build it from scratch.

Enter your own dimensions and configure every detail — feeding holes, cable pass-throughs, custom cutouts, and more. Our live configurator shows you exactly what you'll get before you order.

  • ⚙️Custom cutouts for powerheads, reactors & more
  • 📐Enter any tank dimensions — no model required
  • 🔵Feeding holes, evaporation caps, cable slots
  • 👁️Live preview updates as you configure
Build Custom Lid →

From design to doorstep within a week

01
Choose Your Tank
Select your aquarium manufacturer and model, or enter custom dimensions.
02
Configure Your Lid
Add feeding holes, cutouts, evaporation caps, and more — see it all live.
03
Approve the Proof
Review your exact lid dimensions and confirm before we cut a single piece.
04
Receive Within a Week
We build and ship your custom lid fast — most orders arrive within a week.

Why Choose Us

Online Configurator
Design your exact lid online with a real-time live preview. Choose cutouts, feeding holes, evaporation caps, and more — no guesswork.
Free Shipping
Every lid ships free to the continental US. No minimums, no surprises — just your custom lid delivered to your door.
Guaranteed Fit
Every lid is precision-cut to your tank's exact specifications. If it doesn't fit perfectly, we make it right — no questions asked.
Made in the USA
Proudly manufactured with premium American materials. Every lid is handcrafted in our facility with free shipping in the continental US.

Trusted by Reef Keepers

Reviews from some of our happy hobbyists.

"The online configurator made it so easy to get exactly what I needed. Fits my Waterbox perfectly — love it."

Sarah M.
Waterbox Clear 16

"Amazing quality and the 24-hour turnaround is real. Had my custom lid in hand the next day."

Mike T.
Red Sea Reefer 250

"Perfect fit on my Red Sea. The custom feeding hole placement is exactly where I wanted it."

Jennifer K.
Red Sea Reefer 170

"Best aquarium lids on the market. Made in the USA and the craftsmanship really shows."

David R.
Innovative Marine Fusion 40

"So much better than waiting weeks for a lid. Ordered Monday, running by Tuesday morning."

Lisa P.
Fluval Evo 13.5

"Free shipping and a guaranteed fit. Couldn't ask for more. Already ordered a second one."

Robert H.
Custom build — 36"×18"

Ready for a lid that actually fits?

Choose from 180+ supported tank models or build a fully custom lid in minutes.

Shop All Lids →Build Custom Lid