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How much % of water do you change during the weekly tank maintenance?
20~30% should be minimal. Up to 50% is needed if there is excessive nitrate. The goal of partial water change is to lower the nitrate, phosphate, and other organic waste, at the same time to restore the water buffer and minerals.
How often and how much do you feed your fish?
You really need only need to feed once a day and no more than the fish can finish within a minute. Remove any leftover fish food immediately after feeding.
12 hours of lights a day is the absolutely maximum you should not exceed, but even 12 hours can be excessive if you are getting lots of algae. Lower the time to 10 or even 8 hours a day will help to control the algae. If it is needed, completely blackout of the tank for a few days can be used to reduce algae too. Fish don't really need the lights, there will only be negative effect if your tank is a planted aquarium.
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