05-01-2011, 01:34 PM
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FYI, nano tanks require a lot of time and attention to keep the water chemistry stable. The smaller the tank the harder it is going to be to keep stable, meaning the more time commitment it will be for you. A sump can greatly increase the amount of water volume, lending overall stability and is something to be considered. Marine fish are very sensitive to water chemistry, so frequent or rapid swings in salinity, ammonia, nitrite, nitrate, etc. can mean the difference between life and death.
Also, lighting in a marine tank is vital. Even a tank with nothing more than live rock needs to be lit properly so the organisms and small "critters" can grow properly. Lack of lighting contributes to die off of coraline algaes and the "critters" that live inside of the rock, which can quickly pollute water. Polluted water can cause many issues in cycling, prolong cycling by weeks (and even longer in some cases), and will make the entire tank much more difficult to stabilize. Be sure you have everything in place before you get started. Marine tanks can be extremely expensive if you make these simple mistakes at the beginning. Patience is the one thing you will need over all else in this hobby. Without it you would simply be throwing money away.
Nano tanks are great if you can provide daily care/maintenance. If time is an issue for you then the larger the tank is the easier it will be to be successful.