when is the last time you cleaned the endcaps? Use a good contact cleaner on them and see if that works. Had trouble with only half the bulbs on my 8 bulb tek. 2 bulbs on each ballast, cleaned the ends, no probs for the last 8 months.
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tank 1 260 mixed reef, 3 ai hydra , Bubble magus curve 9
tank 2 300 gallon mixed reef. 3 evergrow It5080, skimmer bubble king
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