OGFrenchHorn,
No pennies or bleach..... But many moons ago I used to pee in the sump. It started as a conversation at IMAC with some other people that were growing acros. I forget what our theory was for what we were adding to the system with urine. But it was funny. As I have gotten older I keep having to take more and more prescriptions, and so my urine ain't quite so clean and I stopped tinkling in the tank.
People will add the darndest things to their tanks in the hope of success
Dave B