I picked up a 20 long...and a new betta who went into my 5 gal
The 20 is just for a future, unknown project. I'm still working on my 55 gallon right now.
However, just for conversation's sake, what is the cheapest anyone has done a full setup from the Petco $/gallon sale? Eggcrate lid + shop lights + diy sponge filter wouldn't run you that much, eh? I guess you'd need to buy a heater. And an air pump if you didn't already have one.