Fish

The sacs under a bubble eye goldfish’s eyes are fluid-filled skin, not eyes, and they tear on anything sharp. What that means for the tank, the food, the price, and the day a sac pops.

Goldfish colors range from classic orange to rare blue and calico patterns. Here’s what determines each color and how to keep it bright.

Telescope eyes that see poorly, a slow body, and a ten to fifteen year lifespan. Tank size, safe tank mates, why they fade to orange, and the buoyancy fix.

Sinking pellets beat flakes, and overfeeding kills more goldfish than disease. How much, how often, which vegetables help, and what to use when you have no fish food.

Koi symbolise perseverance and transformation, from the carp that became a dragon at Dragon Gate. What each colour means, why direction matters, and the Japanese tradition.

76 to 82°F, with 78°F a safe daily target. Why room temperature usually isn’t warm enough, how to tell if your betta is too cold, and what counts as too hot.

A koi fish tattoo means perseverance and transformation, from the legend of the carp that becomes a dragon. What each color means, which direction to face, and the truth about the upstream rule.

Butterfly koi fish are long-finned koi bred in 1980s North Carolina. Their size, lifespan, color varieties, price, pond needs, and how they differ from standard koi.

A baby goldfish is called a fry and starts life transparent and brown, not gold. Growth timeline, feeding, water challenges, and why so few fry survive.

Female betta fish have shorter fins, muted color, and can live in groups called sororities. Identification, sorority setup, breeding, and health quirks explained.