Journal Marcel's next experimental design - suggestions welcomed

@PeerUnk, don't be fooled by the photos that were taken after the water change (and maintenance). The algae is there (more in some places, less in others). Nowadays, even cyanobacteria have appeared in some places (which could be a serious problem in a few weeks). But this is simply inevitable with experiments like this.

1. I started this experiment on 2024-10-04, so today it's 5 weeks old. I plan to let it run for a few more weeks (mainly because of A.pedicellata and P.deccanensis).
2. Ammannia in aquarium #6 completely rotted away, and in a few days it will be followed by Ammannia in aquarium #1 (and maybe even #3, where it was initially in the best shape before I made one planned intervention). I have also already removed R.wallichii from aquarium #7 and H.corymbosa from aquariums #1, #5 and #7, where they were already reaching the surface.
3. I only have a tiny sponge in them (about 1 inch in size).
 
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completely rotted away
Have you considered to add the same plant again to these tanks. It would be a small effort, I see no downsides of doing so, and it would reduce the risk that these plants were just not lucky first time and build more confidence in the conclusions of the experiment.

Just a thought.
 
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