So I am cleaning algae off the inside of my aquarium. Yes, I have algae. I have a slightly planted tank, so I have extra watttage on my lights and I overfeed so I don't have to use fertilizers for the plants....so back to cleaning the tank. So I have my razor blade and I am scraping the tough little green dots off and work my way to the back of the tank. Scrape, scrape, oh that heater is hot! Scrape, scrape.... My daughter says "Mom, that fell." I continue scraping with my arm in the water, I look in the tank and what do I see? The bottom half of the glass case for the heater. My eyes dart up to the heater, orange light on, arm in water, electricity, forget to breath, I see spots as I yank my arm out of the water! I immediately unplug the darn thing and throw it in the trash. Nervously grab the glass out of the tank, throw it away and finish scraping algae.