I have a 29 gallon that I put together with economy in mind. 40 lbs of sand, probably about 50-60 lbs of sand, sicce voyager 3 power head, fluval heater and I started with a deep blue dual T-5 lamp fixture then the reef bug hit me and I upgraded to ai sols. My tank is very happy, parameters are very stable. I have lps, sps, softies in it. It has been running for about a year and now I just started my second tank a 34 gallon and I am setting it up the same way.