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That was my experience too. CO2 was some sort inaccessible dark art for the select few.There i saw already some CO² aquariums mentioned, but at that time it didn't say much to me, it wasnt very informative all, adding CO² was a rather out of this world idea and only available to Jet set nerds.
I had a very old aquarium book, with tanks in as you describe. Basically an angle iron frame holding glass panes sealed with some sort of putty or horrible tar like sealant, probably used to cork boats or something, and as you describe Marcel a paraffin burner underneath for heat, and a fuel driven pump for aeration 😵 I wish I'd hung on to it...but I had a clear out, and at the time I thought I'd never keep a tank again 🙁I have seen illustrations of cast iron aquariums kept in victorian times, they seem to have plants and fish, but who knows whether they are actually accurate!
A victorian tank form here http://www.aquariumarchitecture.com/archive/vintage-aquariums/ it reminds me of your Henry Goes Steam Punk tank Marcel 😉
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