I thought I'd make a little adjustment to my venturi as suggested by Mike Creuzer in a comment on this post on my Venturi air thing.
He thought I should have some extra bubbles breaking the surface, and it turns out it's a bit of a hot topic in great debate all over the place, but I noticed a very slight oil slick on the surface of the water. I guess lots of things case very slight oil slicks. Eucalyptus leaves for one. Uneaten fish food probably would. I suspect an oil slick - and I'm talking an almost invisible one - would have some effect on gaseous exchange between the atmosphere, and my fish tank's water.
I have no idea if that's true, but I figure it couldn't hurt to stir the surface a little.
So I trimmed the pipe carrying water and bubbles down to the bottom by an inch or so and now lots more bubbles exit.
A 1/4 second exposure shows how much extra water movement on the surface is actually going on.
After only a few seconds there was no more sign of the oil slick.
It's my intention to gain a new ability every 2 months for the next 20 years. I'd enjoy some company, some help, and some constructive criticism.
Things so far...
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electronics
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Making smoked foods
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