There are two different types of invertebrates, tropical and cold water. Make sure that the type you are buy is compatible with its other tank mates. A few examples of tropical invertebrates are tubeworms, red hermit crabs, cleaner shrimp and the sea apple. All of this marine life is compatible in terms of water conditions. It is important to monitor the activity and overall well being of the fish in an aquarium. The signs of stress will be fairly obvious. Slow moving or lethargic looking fish will require a stress coat that can be purchased at a local pet store. Try to avoid overcrowding the tank. This should help to reduce the amount of stress caused to the fish. Remember how much was consumed previously and try to replicate that at the next feeding time. Over feeding fish is a common mistake, especially amongst new aquarium owners. The next item on the list of raising a healthy fish is keep the water properly regulated. It is imperative to keep the salinity levels, P. This is probably the easiest to care for of the five types, simply because you are only dealing with one type of species. Amongst the saltwater fish there are both tropical and coldwater types. They can't be kept together for obvious reasons. The water temperatures vary greatly. Tropical fish are usually brighter in color, and therefore more appealing to aquarium lovers than the fish available in the cold water variety. The floating plants will provide this escape for the fish and will add a pleasing effect to the design and decoration of the aquarium. Once your plants are established and growing well, add the fish of your choice and enjoy a beautiful tank. While keeping live plants in the tank, it is important to care for them as you would any other plant. How to Care for and Clean a Saltwater Aquarium Most people are unaware or uninformed of how to properly clean and care for a saltwater tank. It's best to understand how to care for your saltwater tank before even buying one so as to avoid possible problems down the road. The first thing you should be aware of is that you will need to buy filtered water or buy a reverse osmosis kit.