I'm actually intrigued by the stray voltage idea. I did a quick test using my multimeter and it looks like I have 0.6 to 0.7 volts running through the tank. I tried the same test with my pico and read 0 volts. The zoas I moved from the 75 gallon to the pico perked up very quickly. So would 0.7 volts be enough to cause a problem?
Its pretty much just the sps and zoas suffering. The LPS and other soft corals seem to be doing well. The maze brain has about doubled in size in the last few 4 or 5 months. The pulsing xenia are growing and pulsing. Chalices are growing slowly, cyphastrea is growing. So the puzzlement is in what could be causing problems for zoas and SPS but not so much for the other inverts and fish.
It does seem to be more that the corals are losing colour and going tan rather then dark brown. Water changes are about 9 to 10 gallons every week to 10 days. I do have two small leathers so I don't know if that could also be a problem in the larger tank. If so they could go. I'll try to post pictures and dig up my last test results later on.
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