This 24 August 2015 video is about preparations for the AquaHortus exhibition, in the botanical garden in Leiden, the Netherlands.
From 5-27 September 2015, there will be that big aquarium and terrarium exhibition, called AquaHortus.
The displays will be in several botanical garden hothouses and other buildings and in the open air.
There have been earlier AquaHortus exhibitions here.
In the 1950s, this was one of the first places anywhere were one could see luminescent neon tetras in an aquarium.
This is a neon tetra video.