I understand the reason about not wanting to pass current though the fish, and that you shouldn't be in the situation to have it happen. However it does happen, to avoid running current through the fish I can have the ground probe lifted out of my sump for normal operation and push it down before I touch the water. However I have been shocked before, felt it in my chest and definitely took me a minute to feel right. I have even had my hands in some one else's tank and felt a STRONG tingling in my hand. The fact is that stuff happens, is it worth the risk to have NO security blanket? especially with all of these cheap Chinese pumps coming main stream now.