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 47 journal entries.

Latest Fish Care Guides

Crawlable, practical articles linked to calculators and fish entities.

Pristine clear underwater ecosystem
Article · 5 min

The Nitrogen Cycle: Essential Aquarium Chemistry

A glass jar with a planted aquascape, substrate, and clear water
Article · 5 min

No-Tech Jarrariums: A Complete Guide to Self‑Sustaining Bowl Aquariums

Ornamental fish breeding tanks in a small Indian farm setup
Article · 5 min

How to Start Ornamental Fish Farming in India with Low Investment

Lush green planted aquarium layout
Article · 5 min

Planted Aquarium Basics for Beginners

Small bare quarantine aquarium with simple sponge filter
Article · 5 min

Quarantine Tanks: Essential Disease Prevention

A colorful reef aquarium with corals and a clownfish
Article · 5 min

Top 7 Reef Tank Mistakes Beginners Make (and How to Avoid Them)

An overcrowded aquarium with many fish swimming in a tight space
Article · 5 min

Is Your Aquarium Overstocked? Signs, Risks, and How to Fix It

Overcrowded aquarium with many fish
Article · 5 min

Stocking Density and Bioload Management

A sleek wall‑mounted vertical aquarium in a modern living room
Article · 5 min

Vertical Wall Aquariums: Space‑Saving Trend Taking Over Homes

A heavily planted aquarium with an obvious dirt substrate underlayer capped with sand
Article · 5 min

The Walstad Method: Comprehensive Setup Guide for Dirted Aquariums

Test tubes and liquid test kit on a white background
Article · 5 min

Mastering Aquarium Water Chemistry

Knowledge Journey

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.

Guide

#FishTok is Taking Over — How Gen Z is Making Fishing Cool Again

The hashtag #FishTok has exploded, bringing fishing back into the spotlight for a generation that grew up on screens. Here’s how viral catches and ethical angling are reshaping the sport.

Guide

2026 Aquascaping Trends: Biotope, Naturalistic, and Minimalist Designs

Aquascaping is evolving. In 2026, biotope accuracy, naturalistic layouts, and minimalist restraint are the three dominant design philosophies.

Guide

Algae Control: Identification and Solutions

Stop algae from taking over your aquarium. Identify different algae types and apply targeted solutions using light management, nutrients, and algae-eaters.