UNS 45S for Bumblebee Gobies: A Realistic Setup Guide

ByThe Answerlode Editorial Team

Can You Keep Bumblebee Gobies in a UNS 45S?

The short answer: it’s marginal. The UNS 45S holds 5 gallons—technically enough for 1-2 Bumblebee Gobies in a bare minimum sense, but below the widely recommended 10-gallon floor for this species. You can make it work, but you’re operating at the edge of what’s sustainable.

What the UNS 45S Actually Is

The UNS 45S is a rimless tank measuring 17.71 × 11.02 × 7.09 inches. It’s built from 5mm ultra-clear glass with a sleek mitered edge design. The tank arrived with a black leveling mat and is marketed as a nano planted setup—and that’s where it genuinely shines. For small fish and shrimp colonies, it’s an excellent piece of equipment. For Bumblebee Gobies, it’s undersized.

The Critical Thing About Bumblebee Gobies

Here’s the detail most people miss: Bumblebee Gobies are not freshwater fish. They come from brackish estuaries and require salinity between 1.002–1.010 specific gravity (roughly 8–15 parts per thousand). A 5-gallon tank requires meticulous maintenance to hold stable brackish parameters, and any swing in salinity stresses the fish hard.

Temperature needs to sit 77–82°F, with optimal conditions at 79–82°F. They eat live or frozen foods almost exclusively—bloodworms, brine shrimp, daphnia, blackworms. Dry food rarely works. Combine that with their need for hiding spots, a sandy substrate, and 6–8 individuals per 15-gallon group tank for proper social structure, and the 45S becomes a high-maintenance micro-tank.

Why 10 Gallons Becomes the Real Minimum

At 10 gallons, you gain wiggle room for water parameter stability. The larger volume buffers temperature and salinity swings. You can house 2–3 fish comfortably or even attempt a small colony with adequate hiding. A 5-gallon tank offers none of that margin. Any mistake—a missed water change, a heater malfunction, a feeding routine disruption—hits harder and faster.

If You’re Set on the 45S

If you already own one or love the rimless aesthetic, a single pair can survive there. Keep salinity stable with regular testing (a refractometer or hydrometer is essential). Do 25% water changes weekly, use a sponge filter for gentle flow, and provide dense hiding with ceramic tubes or coconut hides. Observe the fish closely for signs of stress—clamped fins, hiding constantly, or refusal to eat mean the setup isn’t working.

Otherwise, consider other nano fish better suited to 5 gallons. Certain killifish species, small pufferfish, or even a dedicated shrimp tank (which is where the 45S truly excels) give you a higher chance of long-term success.

The Better Path

For a genuine Bumblebee Goby species tank, step up to a 15-gallon or larger. The investment in a bigger tank pays off in fish health, colony stability, and your own peace of mind. The 45S is a beautiful piece of hardware—just acknowledge its limits and use it where it shines.

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