All in all there are 4 Main types of Marine Aquariums:
1. Fish only setup
This setup is just the water and the fish, easy to maintain, but relies more on you doing water changes to keep the fish healthy. I know this setup sounds boring but if you lead a busy life and would still like to enjoy your Marine Aquarium after you come home after a hard day, then this setup is for you. Fish only setups can still look just as nice as a live rock and coral setup. You can get decorative rocks, corals, sand and even add what people call a clean-up crew which consist of snails, shrimps and hermit crabs, this setup in general is very low maintenance.
2. Fish with live rock
This setup is slightly different to the fish only setup, because instead of adding ornamental rocks your adding Live Rock – live rock is from the sea, and is made from limestone and decomposing coral skeleton, and are covered with good algae which is beneficial for the eco system in your tank, you can get anything from snails, crabs to starfish that hitch a ride from the sea on this rock which later end up in your tank. Live rock tanks also lay the foundation and give you the option to turn your live rock tank into a reef tank.If you want to see more marine life and don’t mind putting in a bit more work and doing a bit more maintenance then a fish with live rock setup is for you.
3. Reef Setup
A reef tank setup is the most rewarding tank of all setups, this tank is a replica of the sea, it has all kinds of sea life corals, live rock, sand, hermit crabs, starfish and sea snails etc. Everything in a reef tank is living. These tanks are harder to keep, but don’t be put off, with the right information it is possible for you to get a reef aquarium setup and running. Reef tanks require a lot more maintenance than fish only and live rock tanks. So if you want to have the ultimate sea experience in your home, want to see more marine life and are fascinated by the life under the sea, then this tank is for you.
4. Nano Reef Setup
Everything about a Nano reef tank is the same as a normal reef tank, all but the size. A Nano tank is a miniature version of any tank setup, these tanks sound easy due to their size but the truth is there is less margin for error, the reason I say this is because the tank is so small things can change very quickly; for example because there is only a small volume of water in the tank, the water temperature can change much quicker than in a larger tank that has a larger volume of water. People who start with a miniature Nano tank are more likely to have success with a larger tank later on the reason being they are more aware of the needs and demands due to their being less room for error. But don’t be put off by this, one of the first marine tanks I ever owned was a Nano reef tank, with enough research and the correct information these tanks can be a joy to keep and extremely rewarding.