I'm not electrical expert. But here is what is going on. Your lighting is allowing the stray volage into the tank. This happens due to the fact that fluorescent lights produce alot of inductive current across the bulbs. This current can pass to your tank water though salt creep on the wires or...
Heres where I got mine. It easy to do and a lot cheaper than ordering DT's. I use the Nanochloropsus culture its the smallest size.
http://www.florida-aqua-farms.com/Section02/FAFw2.htm
If you are looking for a good product that includes Plankton and Rotifers try...
