Various fishtanks in varying degrees of tannins, commonly called black or dark water aquariums. Usually soft water (Low mineral), and acidic due to dead foliage. Commonly can be found in Asia or in any other jungle setting. Many labyrinth fish can live in these types of tanks/environments. Such as gouramis, Snake heads, Bettas, Dwarf and normal Cichlids. As well as many tetra species.

I did a bunch of these mood boards on Tumblr, lets see how bluesky likes em. #Fishtank #Fish #Fishkeeper #Mood #Moodboard #BlackWaterTanks #Botanicals #Tannins #Aquarium

pin.it/1TSF2GFXV
Everything I used can be found here.