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+1 . Water change, and probably give it three to five days, test again, things should be ok
a80 might ve way less for a 20G. its a 15watt light, you should consider a360 or at least a160, unless you want to keep softies or low light...
Darn. Sorry to hear about the startup. Hope things worked out for you. Tank is looking pretty good
monoprioce has a stellar entry level printer for around 200$
Foster City (San Mateo) water varies anywhere from 20 to 120 (rainy days). I wont recommend using tap water even if its below 10ppm. Things like...