This is the least expensive type to set up because you don't necessarily need the better lighting that the other setups require.
Even though this is the least expensive setup, it is not necessarily the easiest to get started with. Getting started may take a little longer than the other setups while waiting for the nitrogen cycle to complete. Fish only aquariums also require more frequent tank maintenance than live rock tanks. This means that you will need to stay on top of those water changes to remove the nitrates that are constantly accumulating. Having a water test kit is a necessity when keeping saltwater aquariums. You will need to periodically monitor the ammonia, nitrite, nitrate and pH levels. These readings will give you a good indication of the water quality inside your tank. It will also give you an idea of how often you should be performing those water changes.
As the name implies, this type of tank is really for keeping fish only. You may be able to keep a few snails or hermit crabs to help control any algae problems. There are generally two types of fish only tanks. Community type tanks and semi-aggressive type tanks. The community tanks house species that will get along well with the other species in the tank. Semi-aggressive tanks usually house solitary individuals from different species. Unless you have an extremely large tank, it is normally not recommended to get multiple fish from the same species.
Available from companies on our saltwater fish dealers page.