Built around your tank: Why we made Keepr Lids

The lid problem kept walking into our store

If you spend enough time in an aquarium store, you hear the same problem in a hundred forms: “I need a lid, but I cannot find one that fits.”

Sometimes the tank never came with one. Sometimes the stock cover stopped working as soon as a light arm, overflow, return line, auto-feeder or cable bundle reached the rim. Other customers knew exactly what they wanted: a clean custom lid. But premium CNC-machined options were more than they wanted to spend, difficult to source in Canada, or both.

We heard that conversation constantly at New Dawn Aquaculture. The equipment changed, but the gap did not: aquarium keepers needed fish protection built around the tank they actually owned, not an empty rectangle.

That is why we made Keepr Lids.

Fish do not need much of an opening

An aquarium lid has one job that matters before all the others: keep the livestock in the water.

Jumping can be normal escape behaviour, a response to being chased, or a reflex when a fish is startled by movement or changing light. Stress and deteriorating water conditions can increase the risk. For a capable jumper, one brief trigger is enough.

A lid is not a treatment for aggression, stress or poor water quality. Repeated jumping should prompt water testing, a compatibility check and a review of what changed. The lid is the final physical safeguard while good husbandry addresses the cause.

That safeguard has to follow the whole rim. A cover that closes 99 percent of the top can still leave exactly one fish-sized exit beside a cable or light bracket.

Every lid option solves a different problem

There is no lid material that wins every tradeoff.

We have used glass covers on saltwater systems. They reduced evaporation and helped retain heat, but condensation appeared almost immediately. Film, algae and salt residue accumulated on the wet, brightly lit surface, and light delivery declined as the glass clouded. On a reef tank, keeping PAR consistent meant keeping the glass consistently clean. Removing it also sent condensation to the edges and onto the area around the aquarium.

Screen-frame kits use the same basic construction as a screen door. They are accessible and re-screenable, and they work well for a plain rectangle. Once an overflow needs a notch, two lights need openings and cables need routes, the lid starts accumulating rails, corners, braces and possible gaps. Over time, tensioned mesh can stretch, spline can loosen and a frame pulled in several directions can sag or distort.

Premium CNC-cut lids can look excellent and route around equipment precisely. We considered making them ourselves, but CNC machining would not address the complaint we heard most: custom lids were already out of reach for too many customers. Sheet material, machine time, hands-on design work and cross-border shipping all add up.

Glass can still be right when evaporation control matters most. Screen-frame kits remain useful when replaceable mesh is the priority. We were looking for a different balance: open mesh, equipment-aware customization and a production method that could keep one-off design work from dominating the price.

In summer 2025, we started printing the problem differently

We were already doing significant 3D-printing work in the store, so additive manufacturing was a natural direction to test. Instead of removing a lid from a large sheet, we could put material only where the frame needed structure. Instead of modifying a stock frame around an overflow, we could generate the frame around it from the beginning.

The approach also changed how we retained the mesh. Each Keepr lid uses a black PETG frame with clear 1/4-inch mesh locked directly into it during printing.

That gives us several advantages:

• The rim can stay narrow because it does not need a wide spline channel.
• There is no inserted spline that can slowly release from a groove.
• Cutouts, corners and section breaks are part of the lid geometry instead of modifications made afterward.
• The frame and mesh leave the printer as one finished component.

It also creates a real downside: the mesh is permanent. If it is cut, melted or otherwise damaged, it cannot be pulled out and replaced like conventional screen. The affected section must be remade.

That is the trade: an integrated frame without a spline-retention failure point in exchange for non-replaceable mesh.

Our lid company became a software company

3D printing solved only half the problem. A printer can reproduce a custom file efficiently, but someone still has to create that file.

If every order required a designer to model the tank, position every cutout, split the frame, prepare drawings and export STL files by hand, design labour would push the price back toward the CNC products we were trying to offer an alternative to.

So the key to Keepr was automation.

We built the Keepr Lid Builder so customers can start with a tank profile or enter their measurements, then route the frame around supported overflows, light mounts, cables and feeding access. The builder turns those choices into a live preview and production drawings for review. Once the design is approved and ordered, the same geometry generates the manufacturing data and STL files we print.

The customer is not drawing a 3D model, and our team does not rebuild every lid from scratch in CAD. The software does the geometric work between a guided design and a production-ready file. That up-front investment is what makes one-off manufacturing repeatable.

Our first Keepr lid

Our first Keepr lid was built for our Waterbox Marine X 60. The overflow already meant a plain rectangle would not work. The finished layout also needed a side-mounted light support on each side for the ReefBreeders Meridian 11, a feed hole in the front-right corner and a wire cutout in the back-left corner for a wavemaker.

That first build showed us what “custom” needed to mean. The tank dimensions were only the starting point; the lid had to be designed around the equipment already attached to the aquarium.

Since then, Keepr orders have ranged from 11.5 inches wide to just over 47 inches, with one- and two-section layouts using different combinations of overflows, light mounts, feeding access and wire cutouts. The details change from tank to tank, which is exactly why the builder exists.

From measurements to a finished lid

The production workflow is deliberately direct:

1. Measure. Enter the outside tank dimensions and glass thickness. Tank profiles are starting points; customers confirm the measurements of the actual aquarium.
2. Design. Choose the section layout and place supported openings around equipment in its installed position.
3. Approve and order. Review the production drawings before checkout. The approved geometry generates the files our team uses to print the lid.

We keep adding tank profiles, lid elements and clearer guidance, but measurement responsibility cannot be automated away. We manufacture from the dimensions and layout the customer approves.

What a Keepr lid does and what it does not

A Keepr custom mesh lid is designed to reduce the risk of fish escaping, follow the measured perimeter, route around supported equipment and preserve the airflow, evaporative cooling and light access associated with mesh.

It does not meaningfully reduce evaporation like glass. It does not correct water-quality or compatibility problems. It is not load-bearing and should never be used as a shelf or allowed to support a pet.

Keepr currently uses 1/4-inch mesh. Fry, very small nano fish and slender animals may pass through a 1/4-inch opening and need a finer barrier. Choose a cover based on the smallest livestock in the aquarium, not the largest.

Finally, a custom lid can only follow the information supplied. Measure the exact tank, account for installed equipment and review every production drawing before approval.

From one recurring question to a growing production floor

Keepr began with a problem customers brought into our store over and over. In summer 2025, we set out to answer it with the manufacturing tools we already knew. The surprise was how much software it took to connect an aquarium, an online design and a printer.

That workflow now works from end to end: a customer can describe a one-off lid online, the system can generate production-ready geometry, and our team can move it to manufacturing without recreating the model by hand. Our next challenge is capacity: refining the editor, expanding supported configurations and adding large-format printers so more tanks can get an answer built around them.

Start with your tank profile, place the equipment openings your setup needs and review the lid before it is printed.

Design your lid in the Keepr Lid Builder

Frequently asked questions

Why do aquarium fish jump?

Fish may jump as normal species behaviour, to escape a threat or aggressive tankmate, or when startled. Stress and poor water conditions can contribute. A lid reduces the chance of escape, but repeated jumping should prompt a review of water quality, compatibility and environmental needs.

Is a mesh aquarium lid better than glass?

It depends on the aquarium. Glass reduces evaporation and retains heat, but condensation, algae and salt make cleaning and light verification part of the maintenance, especially over coral. Mesh preserves airflow and evaporative cooling while placing less solid material between the light and water, but it does not control evaporation.

Can a Keepr lid fit around aquarium equipment?

The Keepr Lid Builder supports routed features for overflows, light mounts, wire passages and feeding openings. Measure equipment in its installed position and confirm every opening in the production drawings before ordering.

Can the mesh in a Keepr lid be replaced?

No. The clear mesh is locked into the PETG frame during printing. If the mesh is damaged, the affected lid section must be remade.

Is 1/4-inch mesh suitable for every fish?

No. It is an effective physical barrier for many aquarium fish, but fry, very small nano fish and slender animals may fit through a 1/4-inch opening. Use an opening size appropriate for the smallest livestock in the aquarium.