So your lead wires are boiling the tank juice? Have you checked for any high resistance at the solder joint?
I havent kept up with the store bought stuff since I have only used my homemade atty for the past couple years...so I cant visualize your setup...but they all work on pretty much the same principal. I know some liquids just turn dark faster than others too.
Hey Nic, How you been doing?
Haven't seen you in a long time. Hope things are going well.