Blackwater aquariums

https://www.reddit.com/r/BlackwaterAquarium/comments/xxqlqi/nitrification_in_blackwater/

https://www.2hraquarist.com/blogs/ph-kh-gh-tds/is-low-ph-in-tanks-due-to-aquasoils-softwater-a-concern

Using a sphagnum moss bog as a filter

Coral Red Pencilfish

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https://tropicalfreshwaterfish.com/biotope_amazon_blackwater.htm

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Sword plants, Heteranthera, Ceratophyllum, Vallisneria, Cabomba

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