the 24 gallon only comes in one model so far and thats with 72 watts using 50/50 bulbs. Ive noticed that the nano cube is actually made by BOYU(says boyu on the lights). I don't know too much about Boyu, but i think they are a company in Europe. Im assuming jbj is just a distributer and doesnt actually produce the nano cube. Like the 12 gallon, the new 24 gallon has lived up to its name. I filled the 24 gallon up and its as MOST 21 gallons, put in substrate and we are looking at a 19 or 20 gallon tank. Also, the specs on the website, and the nano cube box, say that the cube is 19.7 inches wide, when it is only about 17 inches wide. 19.7 and 17! This is a huge difference when we are dealing with such a small tank. I was really disappointed to find out that the tank was not a true 24 gallon. Any ways, I got my latest shipment in. The list includes, ebo jager heater, CO2 canister, sms 122 ph controller, miwaulkee solenoid, and 3 bags of eco complete. Looks like I'm going to be having a merry christmas-and one heck of a credit card bill!