I was hoping someone could help be understand the best placement for my air stone. My understanding is that it’s not the oxygen bubbles being released in the water but about them breaking at the surface to create a gaseous exchange. Every YouTube video I watch the airstone is placed at the bottom of the tank. I have suction cups on mine (it looks like a CO2 Diffuser). Is there a benefit to having it low in the tank or closer to the surface for more surface agitation?