Starting off with a 10 gallon is fine. Yes problems with water quality happen faster, but if you stay on top of weekly water changes and water testing you will be fine. Also do not over stock it, that is where you need to really pay attention. I started with a 20 gal with no sump, reactors, skimmer, or filter, just power heads and have had great success. I do weekly water changes of 10-20% and 40-50% monthly changes. Just get a turkey baster and blast your rocks before you do a water change to get the fish poo etc. out of the tank