I did a 50% pwc
and then fed the fish. Then one of my kids distracted me while the other grabbed the food and started dropping tons in. It's like they had it all planned out! Then I had to do ANOTHER 50% change so I could suck out all the food and in the process I knocked the lava rock off the driftwood which then floated to the top and uprooted my poor little plants... It was a disaster. I got it all put back together and king Neptune is no worse for wear.
The moral of this story: never take your eyes off the food until it is safely in the cabinet where mischievous little fingers cant reach it.