I normally have my actinics on for 12 hrs a day and 10K on for about 10hrs a day. During summer months I have the actinics on for 10 hours and 10K bulbs for about 7-8 hours to minimize impact on the tank's temperature. I use T5s though, so metali halides would normally run shorter probably for about 6 hrs a day, with actinics running for 9-10 hours.
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There comes a time in this hobby when it's just cheaper to silicone around the windows.
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