Water Hardness Guide
Water hardness becomes confusing because GH, KH, alkalinity, pH, calcium, and magnesium are often discussed together even though they are not interchangeable measurements.
Guides & advice
Aquarium Guides
Using RO Water
Reverse-osmosis water gives aquarists a low-mineral starting point, which can be useful when tap water is too hard, inconsistent, or unsuitable for sensitive livestock.
Water Conditioner Guide
Aquarium water conditioner is easy to use, but the reason you use it is worth understanding.
Water Change Calculator
Water-change percentages are easy to talk about but less convenient when you are standing beside the aquarium with a bucket.
Best Fish Foods
Choosing fish food: flakes, pellets, wafers, gels, frozen and live foods, matching food to each species, portions, storage and routine.
Best Shrimp Foods
Choosing shrimp food: a staple diet, protein and growth foods, plant-based and mineral-rich foods, feeding shrimplets, and how much to feed.
Snail Feeding Guide
Freshwater aquarium snails are often described as cleanup animals, but that description can be misleading.
Live Foods Explained
Live foods for freshwater fish: common types, when they are useful, culturing them at home, feeding them safely, and avoiding parasites.
Frozen vs Dry Foods
Frozen versus dry fish food compared on nutrition, palatability, storage and water quality, and how to combine both in a balanced diet.
Feeding Fry
Feeding fish fry: choosing the first food, matching food size to growth, how often to feed, live and prepared foods, and protecting water quality.
Overfeeding Problems
Overfeeding is one of the easiest freshwater aquarium problems to create because feeding feels helpful.
Feeding Schedule Guide
How often to feed aquarium fish, why portion size matters more than the clock, fasting days, feeding fry, and automatic feeders for holidays.