Aquarium fish have special water requirements. That is why there are whole shop aisles dedicated to water tests for mineral content, PH levels, disease treatment and water treatments. City water can have chlorine or fluoride. Well water can be too high in mineral content like iron, copper, or sulfur. Fish don't like sudden temperature changes. Depending on the type of fish, … [Read more...] about 7 Reasons To Not Put Fish In Your Trough