by mat
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"Do you realise that every blade of grass is a different shade of green?" - from My Voice Will Go With You
Interesting! Does the tank stay outdoors all year? If you, don't you have any problems with freeze or it cracking?
it's only been there a few weeks, so it's hard to say. the fish seem happy though - they've spawned and everything..
"yeast-powered CO2 reactor"? Wonderful. That's crying out for a Heath Robertson-style Explanatoory Diagram.
Like the Elvis-proofing.
However it works the plants look pretty happy on it. Mine never looked that good when I kept tropical fish.
Dead simple - demijohn with water, bread yeast and sugar, non-return valve running to an airstone in a diffusion bottle (ie, a bottle stuffed with filter media to provide large surface area - to keep bubbles in the water as long as possible).
The trick, I'm told, to growing aquatic plants is LOTS of light - photons are normally the energy bottleneck. That tank has two BIG tubes in, and in the evening, you can watch oxygen streaming off the plants. Because of all the light, the limiting factor became CO2. The reactor seems to work. Plants certainly grow like mad in there.
Living with a marine biologist with a fish-keeping obsession is certainly educational.
looks like happy fish, happy plants. just thank god you don't have raccoons in your life.