Thinking about adding “just a few more fish” to your 20 gallon tank? Before you do, here’s what actually determines whether your aquarium can handle it and why balance matters more than math.

More light doesn’t mean healthier plants. Discover how excessive lighting fuels algae and why most freshwater aquariums thrive with just 6–8 hours a day.

Overfeeding is the most common aquarium mistake I see, and it’s often the hidden cause of ammonia spikes, cloudy water, and biofilm. In this short video, I break down a real 20-gallon tank case and show how simple feeding changes stabilized the entire aquarium.