Honestly, if you're gonna go with a nano sized tank, I'd try to figure a setup that also allows you to plumb in a sump. I started with the 24g nano cube and I hate that I ever used that thing. Too small a system to easily keep good parameters because the smallest thing changes everything drastically. Furthermore, it limits you so much to what you can do with the system because the whole all in one makes things hard. If I could do it over, I would still start with the same size but go with an overflow system that goes to a sump so I can increase the volume of the system but have same DT size and be able to play with filtration and refugium abilities.