Best Filter for Oscar Fish: Complete Buyer’s Guide

Choosing the best filter for oscar fish is one of the most impactful decisions you’ll make for your tank, and skimping here is the single biggest mistake we see new oscar keepers make. Oscars produce more waste than almost any…

Best Tank Size for Oscar Fish

Oscar fish tank size is one of the most important decisions you’ll make as an oscar keeper, and getting it wrong leads to stunted growth, aggression, and chronic health problems. We’ve kept oscars in everything from 55-gallon tanks (a mistake…

Cold Freshwater Fish: Best Species for Unheated Tanks

Cold freshwater fish — species that thrive without a heater in room-temperature or unheated aquariums — offer a lower-maintenance alternative to tropical setups. We compiled this guide covering the best cold-water species for unheated tanks, their temperature requirements, tank setup…

Clownfish in a 10-Gallon Tank: Setup Guide

Clownfish in a 10-gallon tank — is it possible, and is it a good idea? This is one of the most common questions from beginners drawn to clownfish by their popularity in movies and marine aquarium displays. We break down…

Ammonia in Aquarium Water: Causes & Solutions

Ammonia in Aquarium Water: Causes & Solutions Ammonia in aquarium water is the number one killer of pet fish, and most of the time, the owner does not even realize it is happening until the damage is done. We have…

How to Test Aquarium Water: Complete Guide

How to Test Aquarium Water: Complete Guide Knowing how to perform an aquarium water test correctly is one of the most valuable skills you can develop as a fishkeeper. We cannot overstate this: the difference between aquarists who consistently keep…