Fresh to Salt Conversion

[Taqpol]

Nanos are good if you are scared of the money investment involved with live rock, sand, and others supplies that are based on tank size. For this exact reason I started a nano and now I'm really kicking myself because I want to upgrade to a larger tank (75-90 gallon). Literally for $10-$50 more than what I paid to light my 20 gallon tall I could be lighting a 4 foot tank...

 

[Shuumai]

I have a 20 gallon long tank. I think I saw something about nanos less than 20g. How low can you go?!

 

[ILoveReefer]

I've seen refractometers on ebay for about $30 USD total. Good?
There pretty good for 30 bucks. I would deffinetly recommend it. I have had mine for a year or so and is dead on. You do have to recalibrate every so often but it's easy to do.