So at the wife's recommendation
I picked up a little AIO 3gal Pico at the MASC bbq. It was just the tank so I'm still gathering all of the equipment for it but am just about done. Equipment will be an Eheim Jäger heater, Rio 90 return pump (85gph), and an AI prime for lighting. ATO will be done via a float switch and tied into my main Apex unit on the 20L. We haven't settled on a definitive stock list yet but are leaning towards a euphylia/mushroom heavy tank. Pics to come later. The only pieces of equipment I'm waiting on to come are the heater and the pump I'll be using with the ATO.