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as long as you have good surface movement you will have plenty of oxygen. air stones and venturi setups don't put extra oxygen in the tank as the bubbles are too big, all gas exchange happens at the surface. The only exception is if you run c02, you need no surface movement and the plants provide oxygen.

The purpose of both is to make small bubbles and swirl the water around. I have both an airstone and also an attachment that adds bubbles to my filter outlet. I actually find the airstone more useful for two reasons: 1) When doing powdered food like Bacter AE, I turn off the filter so as not to draw the particles into the sponge. I found that the airstone actually creates a lot of water swirling even on the far side of the tank. 2) For the same reason, if doing a H2O2 treatment where you don't want to drag water thru the filter media, the airstone is good The advantage of the venturi-type system is that if you adjust it right, to have only a few bubbles worth of air intake per second, it can actually be nearly silent

That's exactly how I would start with selective breeding for higher quality. Separate as many good shrimp as you can into another tank.

Thanks Simon and jayc. I have several grades and patterns amongst the CRS. How do you guys think I should go about more selective breeding? Pick a quality I like then separate a few that have that quality? Lizzy

Well done Cesar

Success! Thanks so much guys. Appreciate the help.