How to Control Aquarium Algae Without Upsetting Your Fish
Control aquarium algae with steady light, feeding and maintenance while protecting fish and plants.
water quality
Why Is My Aquarium Water Cloudy? A Troubleshooting Guide
A step-by-step way to investigate cloudy aquarium water without making sudden changes that stress fish.
How to Do an Aquarium Water Change
A practical walk-through of partial water changes for freshwater tanks, from how much to change to treating tap water and protecting filter bacteria.
Common Aquarium Fish Diseases: Ich, Fin Rot and More
How to recognize ich, fin rot, velvet, dropsy and other common fish diseases, and why testing your water comes before any treatment.
Why Is My Fish Gasping at the Surface?
Fish gasping at the surface is one of the clearest signs that something in the aquarium needs attention, often quickly. Low oxygen, poor water quality, overcrowding, water that’s too warm or illness can all make it hard for fish to…
Why Is My Goldfish Staying at the Bottom of the Tank?
A goldfish resting near the bottom of the tank isn’t always sick, but a sudden or lasting change in behavior is worth looking into. Water quality, oxygen levels, temperature, stress and illness can all make a goldfish sit on the…
How Often Should You Change Betta Fish Water?
Clean, stable water does more for a betta’s health than almost anything else you can buy for the tank. How often you change it depends on the size of the tank, whether it’s filtered and cycled, what else lives in…