I got my first tank over 15 gal after I moved out... due to parental veto... That was a couple of decades ago, but I still feel your pain.
Not much you can do, though, while it's not you but the old man who pays the mortgage, water and electricity, and your allowance...
There is much you can do with small tanks, though. There really is. Trust me on that, because it's all I had as a youngster. Be creative.
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