After a couple of minutes she called out from the kitchen "You might want to just check to make sure the cats and fish are playing together ok".
I dashed to the bowl, expecting the water to be red with fish blood and entrails, but only Brownie was active...she had one paw in the water and was using it to push away the fish so she could drink the water!
When I returned with camera, a couple of minutes later, Brownie had finished her drink and moved away, but Daisy and Snowy were starting to get curious about what was floating about in the water. Daisy dipped a paw in the water a couple of times, but disliked the wetness of the experience...Snowy started dancing about, cos some hard-wiring in her brain was trying to send her a message about cats and fish, but she couldn't quite understand the message.
The Spring-clean was completed without mishap.