The end caps and O rings are best turned on a lathe. Provided the dimensions are correct it shouldn’t leak done this way.
I’ve had a scribble of a plug with O ring grooves for my Biomaster on the coffee table for a few weeks. Hopefully I’ll get round to it soon.
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Great video, you just need to sit back and wait a few billion years for eukaryotic life to evolve.
It's really interesting to see a project so different from the norm.
What an interesting tank, I love the thought process, ingenuity and the perspective you have approached it.
I imagine the you will/have learnt substantially more trying to grow cyanobacteria than many ever will in trying to rid their tanks of it.
I would posit that, in some fashion, a mini evolution takes place in most planted tanks as bacteria and algea come and go, replacing each other as conditions alter changed even by their own presence, and that this mini evolution is necessary in order to achieve balance.