A good rule is to change 10 to 15 percent of the water each week. If your tank is heavily stocked, bump that up to 20 percent each week. A lightly stocked aquarium can maybe get by for two to four weeks, but this should be the maximum length of time between water changes..
Also asked, do you need to do water changes in a planted aquarium?
You should do a routine water change one time every 1 to 2 weeks. It is recommended that the amount of water changed is from 10% – 50%. The more frequent the water change is done, the less water needs to be removed. Planted aquariums can go longer without a water change sometimes up to a month.
Likewise, why fish die after changing water? The cause is more complex than that. Over time the by-products of fish waste, uneaten food particles, dead leaves from plants, etc., alter the chemistry of the water. When a sudden, large water change occurs, it causes such a drastic shift in the makeup of the water that the fish often cannot tolerate it and they die.
Similarly, you may ask, how long do you wait to check your water after water change on your aquarium?
Wait a day or two after the water change to do a test. Depends on your water flow and turn over. In small tanks it could be as short as an hour or two, in larger tanks it probably should be a little longer.
How long does it take for tap water to be safe for fish?
Tap water should be safe for fish species that prefer slightly acidic water conditions but the fish must be introduced into the tank slowly by adding the water into a bag containing the fish for about 20 minutes before introducing the fish into the tank fully.
Related Question Answers
Do you leave fish in tank when cleaning?
It's not advised to remove your fish when cleaning unless absolutely necessary; removal will stress them and can make them sick. If necessary, gently remove your fish with a net and place them in a large bucket with some of the original tank water.What are some signs of ammonia stress in a tank?
Signs of Ammonia stress - Lethargy.
- Loss of appetite.
- Hovering at the bottom of the tank (especially for surface dwelling fish)
- Gasping at the surface.
- Inflamed gills.
- Red streaks or inflammation in the fins.
- Inflamed eyes or anus.
How do you help a dying fish?
Part 2 Reviving Your Goldfish - Identify symptoms of a dying goldfish.
- Look for symptoms in other fish.
- Remove the filter and treat the water.
- Treat the water with a heat and salt method.
- Feed your fish veggies and low protein foods.
- Excise parasites with tweezers.
- Use a commercial fish medication.
How do fishes sleep?
The simple answer is yes! They are sleeping, and they can sleep at any time during the day or night. Fish do sleep with their eyes open, because they don't have eyelids (except for some sharks) to close! For fish, sleep is more like a resting period similar to a daydream that humans might experience.Can you do too many water changes?
If you are not cycled, too frequent a water change is *not* beneficial (sorry LAGlocker, I disagree with you), since you will slow down your cycling process. Certainly you will artificially keep your nitrite and ammonia readings low, but your tank will not be cycled.Are daily water changes bad?
No water changes are not bad, doing daily ones isn't really necessary unless you have a high billows in a small space. Typically the recompense amount is 50% WC in a weeks time. So two 25% WC to keep everything in check.Are water changes good for plants?
Keep in mind that water changes do more than lower nitrates. Fresh water replenishes nutrients that dissipate over time, adds more oxygen into the water, helps to maintain a steady pH levels as pH naturally drops over time.Do I really need co2 in my planted tank?
A. You do not have to add carbon dioxide to grow beautiful aquatic plants. If your lighting level is high, you are likely to have algae problems if you do not also add carbon dioxide; but with low to moderate lighting, added carbon dioxide is not necessary.Can dying plants kill fish?
Dead Plants Can Lead to Dead Fish Another common reason for a fish kill due to low oxygen is when aquatic plants die, either naturally or due to human intervention. If we use herbicide to spray large volumes of nuisance vegetation, the dying and decomposing plants can lower oxygen levels enough to cause a fish kill.Do live plants cause algae fish tanks?
Change 10 to 15 percent of your aquarium water every week to keep nutrients in the water low. Keep live plants: Live plants will absorb many of the nutrients that algae thrive upon. Fewer nutrients in the water mean there is less fuel for algae overgrowth.Do fish produce enough co2 for plants?
CO2 is produced by fish and bacteria as they breathe. Plants and algae remove carbon dioxide from the water during the day and release oxygen, but at night when photosynthesis stops, they respire, consuming oxygen and releasing carbon dioxide.How often should I test my aquarium water?
Fish and plant waste, water evaporation, topping off the water, and water hardness will all contribute to changes in the pH. As a rule of thumb, pH in an established tank should be tested once a month, and any time there is a fish death or illness. 
