[Sk8r]

Also: invest in an autotopoff early. There will come a day even for a nano-nano that you have to be gone for 3 days and can't top off by hand; and if you're toward 50 gallons you're apt to evaporate a gallon a day, which is way too much to be doing by hand. Evaporation is not a bad thing: it's a good thing if you're aiming at stony coral or clams, (because you can use it to drive a calcium additive into your tank along with your fresh water.) But with that kind of water evaporation you're either going to spend your life testing and topping off to keep your salinity steady, or you get an autotopoff unit that will automatically suck fresh water from a bucket (I use a 32 gallon barrel) and keep 'making up' that freshwater loss evaporation causes. ALways remember: water evaporates: salt doesn't. If you don't top-off daily, your relative amounts of water and salt are going to go off and off and off.