Agreed on the current and water testing- $30 at Radio Shack or $10 ground probe will fix the electrical. Does your LFS carry pre-made water and do water testing? Do you have a refractometer or at least multiple hydrometers? also... some of the experts might flay me on this, but what about pulling out all the extra hardware and running with a minimal setup? Take out the wave boxes, reactor, etc? If there are extra funds in the budget a QT tank to hold a single coral for a month or two might help minimize the variables. Buy something you don't mind losing for the test (harsh, I know). If it survives, try it in the display and note the reaction carefully in a notebook. Use the DT water for the QT, that will be the first test. Last question: what does the light cycle look like, distance to water, etc?