This was when i was testing the ‘waterfall’ by pumping water from the 4’ glass tank up to the top fibreglass pond and see how the water flows down and where the leak is, if any.
If you look at the left side of the picture, you will see the rags i had to use to clean up all the leaks...
Learning point: Doing a thorough job at this stage to test for leaks will save you a lot of hassle later when you get a lot more things wet or worse still a flooded balcony. Just fyi, I did have my fair share of problems later.