I'm embarrassed to admit this, but when I recently upgraded tanks, I had my old and new tanks side by side. While prepping the new tank, I stopped doing maintenance on the old - like no water changes, no dosing, just feeding to keep the inhabitants alive while running only a heater, vortech pumps, and lights. I figured I'd have everything moved over to the new tank in a few weeks, so it wasn't going to hurt anything. Those few weeks became over 4 months, and when I finally moved my inhabitants to their new home, I tested the old tank's water just to see how bad it became. The Ph was down to 7.3, and this was during the day. What's funny is all the fish, snails, hermits, corals, peppermint and cleaner shrimp were all fine. Kind of makes you wonder!I don't think it is important at all. I feel if you have enough oxygen to breath, so do the fish.
I have not tested my pH in probably 30 years so I don't know what it is but I don't think pH is that important up to a point of course so I doubt fresh air will do anything beneficial.
Of course fresh air can't hurt as I want it myself but if your tank is in a place where you feel fine, so do the fish.
Mine are also in my Man cave and there are no windows. Everything is spawning and my corals are all smiling. The tank was in my basement in my last house for 40 years and I had no problems, no diseases, no deaths, no nothing except of course from jumping out or old age.
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