Evolved1
make sure the pudding isn't too soggy but that just ruins everything
If I'm interested in starting my own tank, what's a good "beginner" size to work with? This is all crazy inspiring!
E: Also, is it true that I need to let the tank sit for 3-6 weeks for the Nitrogen cycle to play out before I can add fish? I just want to know so I can start looking soon!
Proper tank cycling begins with prepping the tank -- making sure it's properly cleaned. Next step in the cycling process is getting your water ready and adding the substrate, live rock (if applicable) etc... and yes, this is when you get the nitrogen cycle going. There are lots of ways to do it, and if you wait long enough, these cycles will occur naturally. Some choose to spike the tank with a bit of dirt. (I don't do this) And others will buy an all-in-one spike from an aquaria store.
I recommend getting the product from the pet store... just add it to the water and the tank could be ready in as little as 24 - 48 hrs.
edit: if you're making your own stand, make sure it's really stable and reinforced... water is heavy (roughly 8lbs per gallon iirc) and larger tanks can be really heavy. Also... be careful with your outlets and things. There are handy guides online to demonstrate how to keep your wiring safe, but basically you want to make sure any water that might drip on and run down along the cords wont make its way into the outlet! That's why most labs have outlets running along the walls at waist height.