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Your complete guide to the aquarium hobby

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Aquarium Tools

Free Aquarium Tools

Everything you need to set up and maintain a healthy aquarium.

Volume Calculator

Calculate your aquarium volume for any tank shape — rectangular, cylindrical, bowfront, and more.

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Stocking Calculator

Check stocking levels, compatibility, and water parameters for the fish you want to keep.

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Units Converter

Convert between gallons, liters, temperature, hardness, and other common aquarium units.

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Recent articles

A three-panel composite showing the best cleanup crew for freshwater tanks: a Plecostomus fish suctioned to glass, a spiral snail, and a red and white striped shrimp
Mar 5, 2026

Complete Guide on Best Cleanup Crew for Freshwater Tanks: Snails, Shrimp & Fish

Tired of algae? Discover the best cleanup crew for freshwater tanks. From Amano shrimp to Nerite snails, learn how to build a natural cleaning team.

Fishes
Invertebrates
A Dwarf Pea Puffer, also known as a Murder Bean, hovering in a lushly planted freshwater aquarium with a vibrant green background.
Feb 25, 2026

The Ultimate Pea Puffer Care Guide: Mastering the "Murder Bean" Aquarium

Master Pea Puffer care with our comprehensive guide. From tank setup, maintenance and feeding "Murder Beans" to choosing the right tank mates.

Fishes
Puffer Fish
A side-by-side comparison of two minimalist nano cube aquariums featuring a sponge filter on the left and a hang-on-back (HOB) filter on the right, showcasing filtration options for a clean aquarium aesthetic.
Feb 21, 2026

Sponge Filter vs. HOB Filter: The Ultimate Guide to Choosing Your Tank’s Life Support

Deciding between sponge filter and Hang-on-Back (HOB)? We compare flow rates, maintenance, and more to help you choose the perfect fit for your fish.

Equipments & Tech
A clean, low-maintenance planted aquarium featuring a school of Guppies swimming among easy-care aquatic plants and a simple hang-on-back filter system
Feb 12, 2026

The Beginners Guide to Low-Maintenance Fish: Perfect Species for Busy Hobbyists

Want a stunning aquarium without the stress? Discover the best low-maintenance fish for busy people. From Bettas to Tetras, find your perfect match.

Fishes
Bright orange ranchu goldfish resting in a human hand underwater, showing rounded body, flowing fins, and textured scales
Feb 5, 2026

Do Fish Have Feelings? The Deep Science of Fish Sentience and Emotion

Can your fish feel love, pain, or boredom? Explore the science on fish sentience and discover how emotional intelligence impacts your home aquarium.

Knowledge
Freshwater aquarium hardscape heavily covered in Black Beard Algae (BBA) tufts in a fishless tank
Jan 30, 2026

How to Identify, Treat, and Prevent Black Beard Algae (BBA) in Your Aquarium

Struggle with black brush algae? Learn the causes of BBA, the best black beard algae eaters, and ways to to clear black fuzzy algae from your tank.

Aquarium
Problems and Solutions
High-grade Mosura Crystal Red Shrimp with opaque white body and red head markings on a dark aquarium substrate.
Jan 26, 2026

Freshwater Shrimp Keeping Guide for Beginners

Start a thriving shrimp colony with our beginner's guide. Learn about water parameters, molting, breeding, and shrimp care for a low-maintenance tank.

Invertebrates
Shrimp
A beautiful red colored Veiltail Betta showing signs of fin clamp
Jan 20, 2026

Betta Fish Clamped Fins: The Ultimate Guide to Causes, Treatment, and Recovery

Is your betta fish's fins clumped together? Learn the causes of clamped fins, effective treatments, and full guide on how to fix a clamped fin betta.

Fishes
Betta Fish
Milky fish aquarium after water change
Jan 18, 2026

Why is My Aquarium Cloudy After a Water Change? (Causes & Instant Fixes)

Fish tank water cloudy after a water change? Learn why bacteria blooms, new tank syndrome, or substrate issues cause milky water and how to clear it.

Aquarium