I would have to agree that a re-homing of the yellow tang, or an upgrade is probably the best thing for the fish.....What brand and how old are your test kits? It does kinda sound like you may have stray voltage "leaking" into the tank. Crappy Tire sells small volt-meters for about $15 that can test that for you.
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260g mixed reef, 105g sump, water blaster 7000 return, Bubble King SM 300 skimmer, Aqua Controller Jr, 4 radions, 3 Tunze 6055s,1 tunze 6065, 2 Vortech MP40s, Vortech MP20, Tunze ATO, GHL SA2 doser, 2 TLF reactors (1 carbon, 1 rowa). http://www.canreef.com/vbulletin/showthread.php?t=50034 . Tank Video here http://www.vimeo.com/2304609 and here http://www.vimeo.com/16591694
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