Why popular aquarium test strips can give beginners a false sense of safety, what they miss, and the liquid test kit every new fish keeper should buy instead.

The best filters for a 10-gallon aquarium, from the AquaClear 20 to sponge filters for bettas and shrimp, plus how to choose the right flow and clean a filter without losing your cycle.

The best beginner aquarium kits from Aqueon, Tetra, Fluval, and Marineland, what each one includes, and the one thing none of them come with that every new fish keeper needs.

What to do when the power goes out in winter: how to keep your fish warm and breathing, how to protect your filter bacteria, and what to do when power comes back.

How to recognize ich (white spot disease) in tropical fish, why it happens, the main treatment options, and how to keep it from coming back.

What the nitrogen cycle is, how to cycle a new aquarium with or without fish, how long it takes, and how to know when your tank is ready.

Practical gift ideas for aquarium and tropical fish keepers at every budget, from stocking stuffers to bigger upgrades they will actually use.