Tank 4 (species list in comments)

William's electric blue gecko (Lygodactylus williamsi)
Yellow-banded poison dart frog (Dendrobates leucomelas)
Golden poison frog (Phyllobates terribilis)
Yellow-headed day gecko (Phelsuma klemmeri)
Dwarf corydoras (Gastrodermus pygmaeus) (not seen, difficult to see due to design of the tank)

Interesting mix of Old World and New World species, but a nice tank and a good use of space! Thank you again for posting the species list!