Tropical aquariums of the saltwater type must also include some living rocks that add to the quality of the fish habitat. Living rocks are any kind of rock that can be added to a tank and have some good bacteria clinging to them. The good bacteria will help keep the aquarium water clean and in good balance.
For the most part, it is recommended that water in tropical aquariums should not be completely changed out. But, it is essential to be sure that the aquarium filter is of good quality, maintained and in good working order. If needed, you can remove some of the water and replace it with fresh water which can improve the water quality sufficiently in most cases. You should also have water test kits handy to frequently test the quality of the water in the tank.
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