Sounds like there might be a short in one of your MH ballasts... What kind of fixture/ballast? Is there any salt buildup or scorch marks around the ballast(s)?
I had a timer for my MH burn once from salt creeping down the ballast cable where I couldn't see it and shorted across the terminals on the timer. Scary. Now I regularly inspect all my electrical stuff.
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90gal Starfire mixed reef, 400W MH (Giesemann 13K megachrome/Icecap E-ballast), (2) 54W T5 Giesemann true actinic, 45gal sump (65W 50/50 PC), ASM G-3 Skimmer, Mak 4 return, Sequence Dart closed loop, foam backdrop, 120 lbs LR, 2" sandbed, & 1 dillhole running the show.
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