Fish

Angelfish are cichlids, so they eat what fits in their mouth and shred what trails. Here are the tank mates that survive that, and the popular ones that do not.

True purple bettas are rare because the species has no purple pigment. Here is what lavender, mauve, and copper violet really look like, and what each one costs.

Bettas breathe air at the surface, so a filter is not about oxygen. It is about ammonia. Here is which filter to use and how to tame the flow.

The world record smallmouth bass weighed 11 pounds 15 ounces, was stripped in 1996 and restored in 2005. The catch, the controversy and the waters that could beat it.

The Ryukin is the humped, deep bodied fancy goldfish that stays hardy. Size, tank requirements, feeding, tank mates and what a good one costs.

A halfmoon betta is a Betta splendens bred for a tail that opens a full 180 degrees. Here is what that tail costs, what it needs and how long the fish lives.

Bettas sleep with their eyes open, lying on a leaf or the gravel with faded color. Here is how to tell sleep from illness and why darkness is not optional.

Walleye carry long canines plus backward angled bands across the palate. Here is how sharp they really are, how they compare with pike and sauger, and how to hold a fish without getting cut.

Pink betta fish are real, but the pink is missing pigment rather than color. Here is how to tell cellophane from marble, what they cost, and how to keep one alive.

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.