Keeping a fish tank is a wonderful and relaxing hobby, but it can turn stressful if your fish start to die off. The most common cause of fish disease is poor water quality so it is vital that you perform regular maintenance on the tank, making sure you do a partial water change periodically and clean out any waste or uneaten food so it does not decay and poison the water.
Many fish disease can be halted if you provide treatment as soon as you see any signs of your fish being sick. Therefore, it is important that you monitor your fish each day to see if there are any signs of illness.
To insure that you always have healthy fish, you should keep the tank clean and religiously perform partial water changes. This will not only keep your fish happy but will make for a better looking tank as well!