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.

A Siamese Algae Eater swimming near a tank wall with algae
Article · 5 min

The Ultimate Algae Eater Face‑Off: Otocinclus vs. Nerite vs. SAE

A person listening to a podcast while watching an aquarium
Article · 5 min

Aquarium Podcasts and YouTube Channels You Should Follow in 2026

A vibrant halfmoon betta flaring its fins in a planted nano tank
Article · 5 min

Betta Fish Care 101 — Why the Siamese Fighting Fish is Still King on Instagram

A sad betta fish in a small, unfiltered bowl
Article · 5 min

Betta Fish Myths Busted: What You Need to Know Before Bringing One Home

A group of colorful female bettas swimming together
Article · 5 min

Betta Sorority Tank: The Ultimate Guide to Female Betta Communities

Dark water biotope aquarium with driftwood and leaf litter
Article · 5 min

Biotope Aquariums: How to Create an Authentic Ecosystem

A blackwater aquarium with tea‑colored water and driftwood
Article · 5 min

Blackwater Biotope: How to Create a Natural Tannin Aquarium for Healthier Fish

Rare Goodeid fish in a planted breeding tank
Article · 5 min

How Aquarium Hobbyists Are Saving Endangered Fish from Extinction

Hands gently releasing a trout back into clear water
Article · 5 min

Catch-and-Release Fishing — Why It’s Going Viral for the Right Reasons

CO2 regulator and diffuser in a planted aquarium
Article · 5 min

CO2 Injection for Planted Aquariums

Three different types of corydoras catfish on sand substrate
Article · 5 min

Corydoras Showdown: Julii vs. Sterbai vs. Panda – Which is Best for Your Tank?

A sleek rimless nano tank on a wooden desk next to a laptop
Article · 5 min

Desk Aquariums Are Trending — Build the Perfect Nano Tank for Your Workspace

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.