I’d do like 8 angels 24 corydoryas aneus like 50 tetras I wouldn’t do rummynose or cardinals bleeding hearts are cool for an Orinoco biotope then maybe like 12 keyhole chiclids, they make colonies like geophagus and I never see them spar in my tank and 4 festivums IMO they only should be kept in a mostly rodi environment. Make sure you cap the dirt because it floats then you can maybe get like a land area with pothos moss and peace lily also do like 16 otos, a word of advice is to never overdo otos cause tons of people especially MD fish tanks extremely overdo things like otos way to early. i Would let it get some sunlight and then maybe 2 60” nicrews or a diy fixture would work. A well scaped comfy black water tank with tons of diversity and micro fauna with fish dancing in a thick blanket of leafs is amazing for the fish and the plants.