Don't know if you have a sump but you can put the air stone in there and also drop your water level in your overflow so it Is splashes more. Bubbles under 2mm are the best at adding oxygen to the water. Also just make sure the return are pointed at the top of the tank so there is a lot of movement and gas exchangeYeah I'm trying best to supply oxygen but more oxygen supply leads to more water flow
Since I have baby fishes strong current can be more stressful
I will let u know as the ich disappesr