Assuming you are asking about the difficulty of maintaining a saltwater aquarium:
Maintaining a saltwater aquarium can be challenging, but also rewarding. While it takes some initial investment and effort to set up your tank and get it running smoothly, once everything is up and running, day-to-day maintenance is not overly difficult.
That being said, there are some key things you need to do on a regular basis to keep your saltwater aquarium healthy and thriving. These include:
-Testing the water quality regularly and making sure the levels of ammonia, nitrites, nitrates and pH are all within the correct range
-Cleaning the filter media on a regular basis
-Performing partial water changes every 1-2 weeks (depending on the size of your tank)
-Checking for signs of disease or pests and taking action accordingly
If you can commit to doing these things on a regular basis, then keeping a saltwater aquarium can be a fun and rewarding hobby.