55g cube tank, setup/equipment questions!

Hi guys, just got a hell of a deal I couldn't pass up on a 55g cube tank but I don't have any particular ideas or goals for it, but it's going to be the first tank I actually put together instead of getting it all in a kit. I'd like to keep it relatively low-tech/low maintenance.

All that being said, imagine you just got this tank and money wasn't an issue, what would your dream set up be? Filters, lighting, flora, fauna, etc.
Just looking for ideas and inspiration!

Thanks!