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.
After only a few seconds there was no more sign of the oil slick.
Doing some digging around. It looks like zinc-air hearing aid batteries can be used as a poor-mans O2 sensor. I think it would go something like measure the current coming off the battery when it sits in an inverted air container in the water.
ReplyDeleteI don't currently have the space, fish, and containers to do a test, but I will at some point if I get a chance.
Knocking down that sheen seems like a good idea to me.