The more time I've had to think about it, I've decided to replace the Kuhli and try to stock only South American species.- Replacing the pleco you could choose small Loricarids of the twig or lizard groups e.g. Rhineloricaria. Also possible: Otothyropsis or Parotocinclus haroldoi. But not Otocinclus proper. (Because of the temperature.)
Would I be overstocking the 75g long with the following?
x2 Red Lizard Whiptail Catfish
x3 Apisto. Ortegai (males)
x20 Red Beckford's Pencilfish
x20 Red Eye Tetra