lot of stuff
easest way is to get a nitrate test change the water when it gets to high.How often should one REALLY clean / exchange water in a fish tank?It probably is, but I do 10 percent changes in my 30 gal tank about every 2-3 weeks and the fish seem just fineHow often should one REALLY clean / exchange water in a fish tank?i would change the water at least once a week, that's what my boss did when i worked at a restaurant.How often should one REALLY clean / exchange water in a fish tank?could you ever imagine an aquarium in a greenish color....full of algae and other dirts.. so maybe it is much better to clean and change the water every week end.. Remember EVERY WEEK END.. Don wait that your fish will be suffocated long before you have the heart to change it... maybe,... it will be too late for you and your and your fish one day.How often should one REALLY clean / exchange water in a fish tank?well I does depend on the type of fish and or plants.. But I have a 55 gallon a 10 gallon and a 150 gallon tank. And I change at least 1/3 of the water a week. Its a job but the fish grow and have brighter colors and just do alot better with water changes. My fish grew very fast with the water changes and my tanks stay clearHow often should one REALLY clean / exchange water in a fish tank?It should be a weekly thing you should add water conditioner when you do thisHow often should one REALLY clean / exchange water in a fish tank?Once a week and do a 20% water change.How often should one REALLY clean / exchange water in a fish tank?i have a 55g saltwater tank and a 20g sump and i change 10% of my water every monthHow often should one REALLY clean / exchange water in a fish tank?I take about 1/3 of my water out about every 2 months.