Controlling an aquarium’s pH level is done through the use of alkaline buffers, which increase water’s pH level, and acid buffers which lower it. To reach and maintain a pH level in the 6. 5 to 7. 5 range, you’ll likely need to use a combination of these products. Always follow the product’s instructions to safely control your aquarium’s pH level. [1] X Research source
If the water is too cold, install an aquarium heater. The wattage you need will depend on your aquarium’s size, with 100 watts being suited for 20 gallon tanks, 175 watts for 55 gallon tanks and 300 watts for 100 gallon tanks. To cool an aquarium in hotter seasons, you can replace the glass top with a screen, and position a fan so it blows across the water. If the water is too warm for an extended period, you should consider getting a chiller, which will help cool the water. [2] X Research source
When you plant your sword plant, add a root tab for some extra nutrients. Alternatively, you can use a liquid plant food appropriate for aquariums. [4] X Research source If needed, you can also transfer your fish and uproot any plants in your tank to change your soil. You shouldn’t need to remove the water from the tank to do this. [5] X Research source
