ACtually, if you aren't injecting CO2, the bubbles will be good. That will make sure your tank stays at least at equilibrium with the air. The aeration only becomes a problem if you are injecting CO2.
From your pictures, I would say the first plant appears that it might not be getting enough light. If it is algae, you can scrub it off with a soft bristled brush, like a tooth brush. The java ferns and crypts look good. If they start to get black spots or holes, you can just remove the old leaves and make room for new growth.
My suggestion would be to think about adding co2 injection to the tank. It makes a tremendous difference, even in a low light setup like you have there.