great addition CDM. are those malaysian driftwood? i see the lung found a hiding spot away from that red tail gourami
what's your reason for choosing black substrate? i know they generally work pretty well in freshwater setup, but they can also turn bichirs into charcoal lol, maybe not 100% of the time and maybe not for all species or all individuals, but i've seen pics and have read people who tried it and didn't like it. at the very least i think it will darken the base color, lessen the contrast, and/or make the color a little dull. i don't know. just my 2 cents.