I used my oxygen tank/diffusion stone on my wort for the first time a few days ago. I have no clue how much I put in it. ran it for 2 minutes at various different levels as I experimented with it. Unless I had it turned way up, I could not see bubbles coming out. I just trusted that it was going in. 4 days later, it has been bubbling steadily for the last 3! Usually it just bubbled hard for a day or two max. Not sure what the result of this will be. Anybody have any sound advice on how to aerate the wort?