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Why Your Desktop Aquarium Needs a Lid

In the aquarium hobby, there is an emphasis on choosing the right tank size, pump, and heater, but there is one essential component that is often overlooked: the lid. While it might seem like a minor detail, especially in a small aquarium, the lid plays a vital role in maintaining a healthy, safe, and stable environment. Let’s dive into why a lid is so important for your desktop aquarium.


Minimizes Water Evaporation

Desktop aquariums naturally have a smaller volume of water, making them more susceptible to rapid water evaporation. Without a lid, the open surface of the water is exposed to the surrounding air, leading to increased evaporation rates. This not only causes the water level to drop more quickly, requiring frequent top-offs, but also affects the stability of your tank's environment. For example, in a saltwater aquarium, evaporation can lead to fluctuations in salinity, which can stress or harm your marine life. Similarly, in freshwater tanks, the loss of water can lead to concentration of dissolved substances, altering water chemistry. By covering your aquarium with a lid, you effectively minimize these issues, helping to maintain consistent water parameters.


A lid also prevents the pump and heater from running dry, which can occur if the water level drops too much due to evaporation. Protecting these valuable pieces of equipment ensures they continue to function properly.


Protects Tank Inhabitants

Lids offer an added layer of protection for the inhabitants of your tank. Fish, shrimp, and other aquatic creatures are often curious or startled, which can lead them to jump or climb out of the water. In a small, open-top aquarium, even a minor scare could result in your favorite fish ending up on the floor. A lid acts as a safety net, keeping your aquatic pets securely in their habitat. If you have other pets, such as cats or dogs, they might be tempted to get a little too close to your desktop aquarium. A lid serves as a protective barrier, preventing them from accessing the water and potentially harming the tank inhabitants.


Additionally, it keeps out dust, hair, fur, and other debris that can easily find their way into an open aquarium, ensuring the water remains clean and clear.


Polycarbonate Lids: Sturdy and Strong

At PNW Custom, we understand the importance of a durable and reliable lid for the long-term success of your desktop aquarium. That’s why every 40oz Micro Tank and 1 Gallon Glass Small-In-One comes equipped with a fitted polycarbonate lid. Polycarbonate is a material known for its strength and resilience, being resistant to warping, cracking, or yellowing over time. It provides a sturdy barrier that withstands daily use while maintaining excellent clarity which contributes to an unobstructed view of your aquarium.




A lid might seem like a small detail, but it plays a crucial role in maintaining the health, safety, and stability of your desktop aquarium. From minimizing water evaporation and protecting tank inhabitants to enhancing the overall aesthetics of your setup, a lid is an essential component for any aquarist. Investing in a quality lid, like the polycarbonate ones provided by PNW Custom, is a simple yet effective way to ensure the longevity and success of your aquarium. Don't overlook this critical element—make sure your tank has a lid that fits both your needs and the needs of your aquatic inhabitants.

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