Will acrylic fish tanks turn yellow over time?

When purchasing acrylic aquarium, many customers ask, "It looks beautiful and transparent, but will it yellow over time?" This question is crucial, as it affects the lifespan and viewing effect of the acrylic aquarium.

Acrylic itself is not prone to yellowing.

High-quality acrylic (PMMA) is a highly transparent and stable material, with a light transmittance of up to 92%, making it clearer than glass. If new and high-purity acrylic sheets are used, they will not significantly turn yellow or brittle after more than 10 years of normal indoor use.

So why do some acrylic aquariums turn yellow after a few years?

The main reason may be the use of recycled sheet materials. While inexpensive, this material is often high in impurities and lacks stability. After a few years of use, problems such as yellowing, surface fogging, and structural aging may occur due to ultraviolet rays or water vapor erosion.

If the acrylic aquarium is exposed to strong sunlight for a long time (such as on an outdoor balcony), it may also show slight signs of aging. In this case, it is necessary to use UV-resistant acrylic sheet.

Therefore, when purchasing an acrylic aquarium, the most crucial thing is to find a reputable manufacturer and confirm the grade of the materials used. As long as the material is reliable, the acrylic aquarium will remain as transparent as new for many years, beautiful and durable.