The Green Journal

Expert Maintenance Fish Care Guides

By The Aquarium Calculators Editorial Team

Explore our collection of maintenance fish care guides and practical articles.

Aquarium Filtration Guide: Types, Sizing, Media and Maintenance featured article

Equipment

Aquarium Filtration Guide: Types, Sizing, Media and Maintenance

How filtration works, how the six filter types compare, and how to size flow for your tank with a worked GPH example.

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Latest Fish Care Guides

Crawlable, practical articles linked to calculators and fish entities.

Black Beard Algae dark tufts on Anubias leaf edges and driftwood in a planted aquarium
Article · 5 min

Black Beard Algae (BBA): Causes, Removal & Prevention

Cloudy Aquarium Water: 7 Causes, Fixes and When to Worry article thumbnail
Article · 5 min

Cloudy Aquarium Water: 7 Causes, Fixes and When to Worry

Blue-green cyanobacteria forming slimy sheets on aquarium substrate and decor
Article · 5 min

Cyanobacteria (Blue-Green Algae): Causes & Removal

Brown diatom algae coating aquarium glass and substrate in a new freshwater tank
Article · 5 min

Diatom (Brown) Algae: Causes & How to Clear It

Long stringy green hair algae tangled around aquarium plant stems and decor
Article · 5 min

Green Hair Algae: How to Remove & Prevent It

Hard green spot algae dots on aquarium glass surface
Article · 5 min

Green Spot Algae (GSA): Causes & How to Fix It

Aquarium with pea soup green water algae bloom obscuring fish
Article · 5 min

Green Water Aquarium: Causes & Fastest Fix

How Often to Feed Fish (And How Much Is Too Much) article thumbnail
Article · 5 min

How Often to Feed Fish

Knowledge Journey

Take Action After Reading

Turn article insights into decisions with calculators, fish pages, and a quick personalized quiz flow.

Calculator

"Why Is My Fish Dying?" Diagnostic Tool

Don't panic — most fish illnesses are treatable if caught early. Select the exact symptoms your fish is showing and our diagnostic engine will identify the most likely cause, whether it's Ich, Dropsy, ammonia poisoning, or a parasite — and walk you through exactly what to do right now to save them.

Calculator

Ammonia Toxicity Calculator (Free NH3)

Enter your test kit reading (TAN), pH, and temperature — get an instant SAFE or LETHAL verdict for Free Ammonia (NH3). Built for API Master Kit users, cichlid tanks, reef setups, and fish breeders.

Calculator

Annual Fish Keeping Cost Calculator

Estimate the true annual cost of your aquarium by entering tank volume, heater wattage, filter and light power, heater runtime, and local electricity rate. Get a practical itemized breakdown for heating, filtration, lighting, water, and routine consumables before you set up, upgrade, or troubleshoot a tank.

Fish Guide

African Butterflyfish

Complete African Butterflyfish (Pantodon buchholzi) care guide. Learn optimal tank size (30-40+ gal), water parameters (pH 6.0-7.5, 75-86°F), surface feeding, breeding simulation, and compatible tank mates.

Fish Guide

African Cichlid

Complete African Cichlid (Mbuna/Peacock/Haplochromis) care guide. Learn optimal tank size (55-75+ gal), water parameters (pH 7.8-8.6, 75-82°F), Rift Lake setup, diet, and species compatibility.

Fish Guide

African Leaf Fish

Complete African Leaf Fish (Ctenopoma acutirostre / Leopard Bushfish) care guide. Learn optimal tank size (40-55+ gal), water parameters (pH 6.5-7.5, 75-82°F), carnivorous diet, and compatible tank mates.