YOUR EVERYDAY FIELD GUIDE

Fishes.

Discover the world on the other side of the glass.

Fishes / Habitat

How to Culture Amphipods and Copepods for Your Aquarium

Copepods and amphipods, generally lumped together as pods by reef keepers, are tiny crustaceans that form the base of a healthy reef tank's food web. They graze detritus and microalgae, and in turn be

4 min read

Fishes / Habitat

Hatchetfish: The Aquarium Fish That Actually Flies

The hatchetfish, most commonly the marbled or silver hatchetfish species sold in the trade, has a deep, laterally compressed body with a sharply curved belly that genuinely resembles the blade of a ha

2 min read

Fishes / Nutrition

How Much and How Often Should You Feed Your Fish?

Overfeeding is, by a wide margin, the most common mistake new fishkeepers make, and it comes from a good instinct in the wrong direction: watching a fish eagerly eat everything offered feels like good

3 min read

Fishes / Health

Is My Betta Fish Too Fat?

Bettas carry weight in a very particular way, and the difference between a healthily filled-out fish and a genuinely overweight one is not always obvious at first glance. Getting this right matters, s

3 min read

Fishes / Health

Saprolegnia: The Fungus That Only Attacks Weakness

Saprolegnia is genuinely everywhere, its spores exist in essentially every aquarium and every body of freshwater, floating invisibly until they find something to colonise. In a healthy fish with intac

3 min read

Fishes / Getting Started

Powerheads and Water Movement: Getting Flow Right in a Marine Tank

Reef environments are naturally turbulent. Waves, currents, and tidal movement keep water constantly circulating around corals and fish in the wild, and that movement does far more than just look good

5 min read