Caring for your goldfish can be extremely easy as long as you follow some basic rules and ensure that the water stays clean all the time. Goldfish is actually a hardy fish that will do fine on their own and they can easily adapt to changes in water chemistry without difficulty as long as the fluctuation is still within the range of their tolerance limit. There is actually no secrets or hard methods involved because if everything is well taken care of, they will live a very long time to become your loyal companion. Today I intend to share with you some of the basic rules, which I follow until today.
Water Quality
Good water quality is the most important basic requirement of all that ensures that your goldfish stays healthy. Conduct regular water changes (preferably twice a week) and between that period, monitor and test using test kit on important water parameters like pH, temperature and hardness level to maintain a certain range, which they would tolerate. Goldfish being a cold water species prefers temperature of the water within 18 to 22 degree Celsius (although 20 degrees is the best temperature to have), pH around 7.5 while maintaining soft water at the range of 3.5 to 6.7 dGH.

Good water quality can also be achieved by maintaining low stocking level. Basically goldfish requires a lot of space for their growth and stays healthy. Read more about getting the right tank size for your goldfish.
Right Food
Food is another thing that you need to take care of because basically what you feed to them will determine their growth rate and body coloration. Always bear in mind that not all fish pellets which are sold in pet stores will be the right type for them and to sums it all, whatever that you intend to feed to them, must be monitored closely to determine whether it is first suitable for your goldfish. Usually if the food is the right one, the poop discharge will be solid and won’t easily disintegrate in the water while the color is also slightly darker.
Mixing different types of live aquarium food and pellets will also ensure that your goldfish gets the best nutrition. From time to time, you can also feed them peas in order to get rid of trapped air bubbles in their delicate stomach.

I think that’s about all of it that you need to know and try to remember one last thing, show your love and care at all times to your lovely pet because they will appreciate what you did for them.
Related goldfish care topics:
Winterizing Goldfish in Ponds
Goldfish Reproduction
Caring for Japanese Jikin and Ranchu