Party and Water spider

An elderly couple was throwing a party but the man had a walker so they wanted a special large port a potty. They were going to bring it themselves to they hooked it up in a trailer and they drove it there.

Looking in an aquarium and there was a giant water spider and he/she was eating everything in the aquarium big and small and I thought that there couldn't be any more but the spider kept finding things hidden in the foliage. I though that this wasn't sustainable because eventually there would be nothing left to reproduce and eat.