I started back in last time with a Waterbox Peninsula 15 which I think is now called a Cube 15. It was, and is, a nice small AIO that I could put lots of places in the house due to the small footprint. I tried to go with mainly equipment that could also be used on larger tanks. I upgraded to a 100 gallon but I set the 15 back up as a QT tank and I'm currently using it for some frag rehabilitation/quarantine. When I don't need it it is easy to take down and store then quickly set back up if needed.Wife is a bit reserved -- but I'm thinking 15g aio, a cheaper but decent light, and go slow.
Less water volume sounds good since the water changes are easier and she'll worry less about 'size'/'cost'.
