The Aquarium Adviser
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Photo by Tanmayee D on Openverse (CC BY 2.0)

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Fish

Koi Types: Varieties, Colors, Feeding, Nutrition & Growth
Fish

Koi Types: Varieties, Colors, Feeding, Nutrition & Growth

Koi are large ornamental carp bred for striking colors and patterns, with varieties like Kohaku, Sanke, and Showa commanding worldwide recognition. Understanding koi types, proper nutrition, and growth stages is essential for successful long-term care in a pond.

Photo by Me in ME on Openverse (CC BY 2.0)

Bumblebee Goby: Tank Mates, Care, Diet, and Breeding
Fish

Bumblebee Goby: Tank Mates, Care, Diet, and Breeding

Bumblebee gobies are small, territorial brackish-water fish best kept in a 10-20 gallon tank with live food and plenty of hiding spaces. Here's what you need to know about their care, feeding, tank mates, and breeding requirements.

Photo by Павлик Лисицын on Openverse (CC BY 4.0)

Guppy Species: Care Guide
Fish

Guppy Species: Care Guide

Guppies are colorful, easy-to-care-for tropical fish ideal for beginners, but breeding them requires understanding how females store sperm and manage fry survival. Here's everything you need to know to set up a thriving guppy tank and breed them successfully.

Photo by Carlos Eduardo Joos on Openverse (CC BY 2.0)

Elephant Nose & Ghost Knife Electric Fish: Care and Electric Organ in Fish
Fish

Elephant Nose & Ghost Knife Electric Fish: Care and Electric Organ in Fish

Elephant nose and ghost knife fish use weak electric organs for navigation and communication, but they require mature, stable aquariums and experienced keepers. Learn their specific care needs, habitat requirements, and why they're not suitable for beginners.

Photo by moollyem on Openverse (CC BY 2.0)

Rainbow Fish Species: Types of Small Rainbow Fish
Fish

Rainbow Fish Species: Types of Small Rainbow Fish

Small rainbow fish are peaceful, colorful, and hardy, making them ideal for community aquariums - but they need proper tank space, water quality, and live foods to thrive and breed successfully.

Photo by moonlightbulb on Openverse (CC BY 2.0)

7 Brackish Water Fish - How Much Salt Do You Need for Brackish Water?
Fish

7 Brackish Water Fish - How Much Salt Do You Need for Brackish Water?

Brackish water aquariums recreate estuarine ecosystems where freshwater and saltwater meet, requiring a salinity level of 1.002-1.007 specific gravity - about 1 cup of marine salt per 5 gallons - and sandy substrate plus power filtration to keep seven fascinating species healthy.

Photo by Joel Carnat on Openverse (CC BY 2.0)

Baby Fish - The Complete Guide to Fry (2022) How to Care & Feed Fry
Breeding

Baby Fish - The Complete Guide to Fry (2022) How to Care & Feed Fry

Breeding fish and raising fry is one of the most rewarding parts of fishkeeping, but success requires proper conditioning, correct feeding, and careful tank setup tailored to your species' spawning behavior.

Photo by Falashad on Openverse (CC BY 2.0)

Killifish: Species, Care, Size, Breeding, Diet & Water Parameters
Fish

Killifish: Species, Care, Size, Breeding, Diet & Water Parameters

Killifish are small, colorful, and easy to breed at home, though they require soft acidic water and live foods. Their short lifespans and specific needs vary dramatically by species, making careful species selection essential for success.

Photo by vastateparksstaff on Openverse (CC BY 2.0)

Goldfish Tank Size: What Size Tank Do I Need for Goldfish?
Fish

Goldfish Tank Size: What Size Tank Do I Need for Goldfish?

Single-tailed goldfish like Comets need at least 40 gallons per fish, while fancy double-tailed varieties like Orandas require 20 gallons each. Exceeding these minimums-and keeping fewer fish than stocking guidelines allow-produces healthier, more resilient tanks.

Photo by IrishErlina on Openverse (CC BY 2.0)