Re: saying goodbye to the "hail mary" of gas exchange
Mine is angled upward, creating ridges on the water surface¹. This and attempting to maintain 10-20 ppm nitrate have allowed me to keep a thriving colony of inverts in a high tech tank for the first time, including successfully breeding shrimp.
The filter is on full blast and I'm also using a nano power head, so flow is noticeable.
The downside is that now I can't keep slow moving showpiece fish like dwarf gouramis. They have a great deal of character so it's a real loss.
¹ Despite this, I still occasionally have a light protein film.