I am going to pop on into this discussion and suggest some reading material here on Koko's for you.... there are some truly wonderful articles. Please excuse me if you have already seen them!
This is a great general article:
http://www.kokosgoldfish.invisionzone.com/...showtopic=11275More general stuff:
http://www.kokosgoldfish.com/care.htmlCycling:
http://www.kokosgoldfish.com/cycle.htmlAs far as air in the water, if your filter (an AquaClear if I recall, correct?) has a "waterfall" effect, falling onto the surface of the water, most likely you will be just fine without an air feature. Most air features are for the asthetics in the tank - that and the mechanical work they do.
The bubbles themselves impart only a little oxygen into the water. The more surface area of the bubbles, the more oxygen they can get into your water - so millions of tiny bubbles are better than a few large ones - but the main purpose for the air feature is to lift the water from the bottom of the tank, to the surface, turning the water over and circulating it well. As the water is lifted from the bottom of the tank to the surface it will pick up oxygen at the surface far more efficiently than it does from the surfaces of the tiny bubbles.
The waterfall effect of the filter also picks up the water from the intake at the bottom of the tank and splashes it across the surface. This agitation imparts a tremendous amount of air into the water. It should be sufficiant for most any needs you have in a tiny 10 gallon tank.
Some medications make it necessary to add extra oxygen to the water, but, by and large, you are probably OK to not have an air feature if you do not wish one at this time.