Many people start with a freshwater aquarium because it is easier to get started and maintain. As they become more experienced they begin to consider keeping a saltwater tank because it offers a new challenge and many new varieties of aquatic creatures to care for. This article will explain some if the differences between saltwater and freshwater fish. It will help you to understand the different challenges you face if you are planning to start a saltwater aquarium.
Freshwater fish are considered to be more robust to water conditions. This is often why people start off with a freshwater tank. The fish have adapted through the ages to living in water that might change rapidly if there is a flood or a drought. Saltwater fish are not this adaptable because they have lived in the sea that doesn't change much in terms of water quality. The volume of water in the sea is so large that any chemical disturbances are diluted to be negligible. Of course this volume of water is not the case in a small sea water fish tank so the responsibility for maintaining the water quality is down to the owner.
Thus the fish are very different. Freshwater fish need to rid the body of excess water and saltwater fish need to rid the body of excess amounts of salt in order to be in harmony with the environment. Saltwater fish need to work harder to maintain harmony within the environment. They are also more susceptible to changes in the chemistry of the water because they have to drink more of it.
Thus the most important part of keeping saltwater fish is maintaining the specific gravity of the fish tank water. This is the level of salt in the water. You need to understand the specific gravity that the species of saltwater fish you are keeping is comfortable in. Then you need to keep the water at this gravity.
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