Normally I would address your points. In this case I will not.1. Your comments are not really inviting the discussion you wanted to have (sorry) or do you feel differently?
2. There are many areas in the ocean (barring storms) where one can dive year around. The exception does not prove the rule or?
3. Have you tested room Co2 with dissolved O2 concentrations I assume you have - that is the correlation?
4. His point (I believe) about oxygen was that in TANKS there is a large difference in O2 during the day - due to coral/algae respiration. (Assuming you dont have a refugium/algae reactor on at night).
5. You seem to be the one making blanket statements. Your friends 1400 ppm CO2 house may also be an exception.
6. it seems to me this is not designed to be a 'discussion' its designed as the other thread was - to prove that your ideas are the 'correct' ones.
When someone comes that has never been to the ocean and wants to debate the ocean with the intent of pushing some narrative that they hold dear then I will dismiss them out of hand. I think my points pretty clearly show this. Your points show the very very outliers to try to be fair to the person that just wants a fight. I am not interested in that.
If you want to come to a discussion to debate the issues like you have done @MnFish1 then I am willing. In fact I enjoy the discussions that we have and no I don't agree with you on many things. Importantly though on many things I do. I am ok with that. Learning is what happens in those places. Most importantly mine.
I am tired of the cage fighting that comes from the need to prove a point so that you can lourd over another person your rightness. I am tired of people pushing agendas. I am not going to fight for the sake of fighting especially when the other party is so dishonest and not credible as to be obvious. I am really sick of it. I can ignore all of that, and move on with my life. My tank will still progress I will still learn and experiment.
I will give you an another example. I was on Facebook and I had one of my 20 plenums up. Some guy decided that what I did was a nitrate factory because he did not know what it was. I asked him several times if he knew what I had created. He did not. At first I tried to educate, but his tone was so aggressive and self righteous as to be cult like. It was creepy. The conversation ended with him suggesting that he would physically decide for me how my aquarium would work. I let him know that perhaps that would be a poor decision in TX. I actually saw him once in the LFS. He wasn't quite the big man there as he was online. I let it be because I don't need to visit or stay in the place where there are bars on your windows. That was three years ago. Because I am in the hobby here, I know that this person is no longer in the hobby. Why it seems like just yesterday that he rolled his giant cooler into the frag sale for the local club and spent a seemingly endless amount on frags. I am sick of dealing with these people, so I don't.