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I was hoping that because there was a layer of sand on top of the dirt it would be alright for cories but if you say otherwise then ok I'll reconsider. The new added plants mentioned in my previous post were some fancier plants that would do better in CO2, and I was considering increasing water flow as well which in my mind would somewhat cancel out the oxygen loss due to more water disturbance. If that's a bad idea then I might just dose mild fertilizers instead because this was only just a thought.I would strongly advise against introducing corys to a tank with a soil based substrate. With stuff the soil puts out it is just not healthy for most bottom dwellers.
As to the CO2, why? Are you doing some exotic plants that require it? With normal plants it is just not needed and not all that good for fish as it replaces oxygen in the water.