In general, cleaning an aquarium is a very mundane and safe task, until you throw a fairly aggressive fish such as the Giant Snakehead into the mix. Cleaning your tank with this monster fish adds a non-standard change to your regular tank maintenance.
There’s a good chance you had the Giant Snakehead as a baby, giving you the opportunity to introduce a very useful tankmate. Plecostomus is a bottom-feeding fish that not only makes an interesting addition to your tank, but also helps keep it free of algae and other debris. If you can, I recommend getting a young-adult to adult Plecostomus on baby as your Giant Snakehead grows much faster, then it can turn him into lunch. If introduced before you buy your Giant Snakehead, or even earlier, they will likely remain tankmates for years to come. Once your Giant Snakehead becomes an adult, try introducing a Plecostomous and watch how fast you flush thirty bucks.
As a teenager, keeping the Giant Snakeheads tank clean is not an overly difficult task. Depending on the size of the tank, I recommend changing the 10-25% water approximately every 10 to 14 days. About 25% of the water in small and medium tanks should be changed, while in a much larger tank (100 gallons+) about 10% of the water should be changed. It is clear that proper filtration equipment is needed to help maintain a clean tank. On the other hand, the Giant Snakehead is a very patient fish that can survive most of the normal PH and Alkalinity levels so maintaining the proper chemicals is not critical. The worst part is that you have to be very careful while cleaning the tank when it starts to grow and become aggressive.
First, get very long handle brushes to clean the edges. It’s best practice to never put your hand in an adult Giant Snakehead’s tank, as they will often bump into something new that goes into the water. Following that, I’ve always used an electric underwater gravel sweeper from your pet store. This is a very efficient and safe method for simultaneously draining the water from your tank and clearing the gravel. It also has the added benefit of never having to reach the tank with a bucket to empty the water during biweekly changes. Finally, you may want to make sure he’s been fed recently to keep him a little more lethargic.
Remember to be very careful when cleaning your Giant Snakeheads tank as they are a dangerous fish. Full-grown Giant Snakes are said to kill adult humans in the wild, and I highly doubt yours will do its best to be smart about tank maintenance. The last thing you want to do is stress him out unnecessarily and inflict serious bodily harm on yourself.