Reading from left to right, these 3 tanks hold a plastic box containing eggs laid in peat by Nothobranchius sainthousei, small fry from a previous batch of eggs and adults of the same species with a box of fresh peat to lay their eggs in. It's a pity that people pass along the corridor from right to left.
Beside these tanks is a video screen and a poster about ZSL's conservation work with freshwater fishes. I think these are all temporary as there is quite a lot of space on the right, running behind the exhibits. I hope that the back wall in the photo will eventually be obscured by breeding, rearing and holding tanks.