Crazy!! I’m doing the same biotope. I’m getting
Congo tetras and African moon tetras
(there’s a couple variants of Congo tetras and other African tetras and barbs that are hard to find and expensive)
Synodontis Eupterus or Nigriventis
African Brown Knife (xenomythus nigri)
You could do Ropefish. I have 2, but I wouldn’t recommend a group of them due to size.
I already have the baby Leopard bush fish, 2 rope fish and 1 African butterfly fish in the tank.
Mine is also 75 g