Love that my circuitry is simple enough that I don’t need to worry about it being broken in the update.

I’d get a plecostimus, you’ll want a tank, heater, water pump/aerator (especially if you get a deep-ish tank), gravel, bucket and some plastic tubing (the last 2 for gravel cleaning/water cycling)

You should let your water mellow and do some chemical tests on it before adding fish to it, you might want to start with some throw away fish or particularly hardy fish.

Don’t over populate your aquarium, don’t rush too many fish into it too quickly.

Another decent option is a beta fish in a planter aquarium, you won’t need to do barley any maintenance with that. They love hanging out in the roots of plants