Fish

The emperor angelfish reaches 15 inches and needs 180 gallons or more. What the juvenile to adult change means for price, feeding and tank mates.

Giant goldfish are ordinary Carassius auratus with enough water and time. Real records, why pond fish grow huge, and what the 67 lb fish actually was.

Fantail goldfish reach 6 to 8 in and live 10 to 15 years. The tank size, temperature and feeding routine that keep them out of trouble.

A koi betta is a marble patterned Betta splendens whose colors keep shifting for life. What they cost, how big they get, and how to keep one well.

How to tell a smallmouth from a largemouth, what they eat, the baits and colors that work, and whether they are good on the table.

Freshwater angelfish are Amazonian cichlids reaching 6 in long and 8 in tall. Tank size, water, feeding, group numbers and which fish to avoid.

Telescope goldfish grow 6 to 8 in and live 10 to 15 years. Tank size, water, food, tank mates and how to protect those protruding eyes.

Red is the most common betta color because the gene is dominant. Prices, tail and scale types, tank setup, and why red bettas fade after a few months.

The big mouth is the giveaway. How to separate green sunfish from bluegill and warmouth, why they stunt a pond, how aggressive they are, and whether to eat them.

Comet goldfish reach 12 in and live 15 years, which is why the bowl is the problem. Size, tank volume, tank mates, and the care details that decide the lifespan.