The Green Journal
Fish Care Articles, Troubleshooting, and Seasonal Guides
By The Aquarium Calculators Editorial Team
Read practical fish care notes for repotting, pests, humidity, watering, fertilizer, sunlight, and beginner-friendly routines. Use header search for all 52 journal entries.
beginner-stocking
20-Gallon Fish Tank Stocking Guide: Best Fish & Combos
Best community stocking ideas for 20-gallon aquariums.
Read guideLatest Fish Care Guides
Crawlable, practical articles linked to calculators and fish entities.
11 articles on this page
Algae Control: Identification and Solutions
Aquarium Filtration: Mechanical, Biological, Chemical
Aquarium Floor Weight Guide: Is Your Tank Too Heavy for the Floor?
Aquarium Insurance 101: What Does It Cover and Do You Need It?
Aquarium Lighting: Spectrum, Intensity & Photoperiod
Aquarium Maintenance Contracts: A Business Opportunity
Aquarium Photography for Social Media: Beginner’s Guide
Aquarium Plant Deficiencies: How to Spot and Fix Yellow Leaves, Holes & Stunted Growth
Plant Propagation Guide: Multiply Your Aquarium Plants for Free
Aquascaping for Beginners — Create a Stunning Underwater World
2026 Aquascaping Trends: Biotope, Naturalistic, and Minimalist Designs
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"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.