If you need something to be anaerobic you can take a tea light and burn it until half the wax is gone. This makes it light enough to float. Place cooled tea light on top of plastic wrap inside your jar( which will support it anyway but better to be safe and use half empty tea light). light tea light and and let it go for a few seconds, then put the lid on top. The candle will burn almost all the oxygen inside then burn out and make a microaerobic environment. Not truly anaerobic but as close as you can get without fancy anaerobes packs.
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