Let me reword this and see what kind of response I get.
From what I can tell, this can be done easily with a 20g long tank (bare bottom), powerhead (30-50x total volume), heater, light, and a frag rack.
Not sure if live rock/HOB filter is needed
I see some people say to add at least one fish, but I'm still debating that one.
Skimmer isn't needed.
I would need to do weekly water changes (10-15%), top off the water, and test as needed.
Does anyone see any downside to this or possibly any issues I am overlooking?