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ive had some PCs over a reef tank for something like 2.5 years with a glass lid and the lights lifted up 2-2 1/2". there is no visible damage to the end caps pr anything for that matter. i think the SW environment is harsher than anything we see in vivariums.
Encase the plugs in silicone, ive had this problem on all my saltwater tanks, plug bulb in and silicone all of, not the bulb though.. stay on plastic all the way back to wires, try not to run till dry!