I have a 2g hang on refugium on my 92g bow front reef tank I added today..... 15 fish over 20 corals. Inverts anems ect... . Should I run the light opposite of my reef lighting..... Or should they run the same time.... Or does it even matter....? Fyi been a reefer for 15 years.... Just joined this forum.... First ever post! From Natrona Heights, PA (20 minutes north of Pittsburgh)
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Welcome to the western PA reefer club! Lol...but seriously, in terms of your question it depends on what you have in the refugium. Some macro algaes use the opposite lighting schedule to prevent them from going sexual, like caulerpa, where others just don't care.
Personally, when it comes to what you are looking at it won't matter very much. There will be nutrient export, but I don't think you'll notice any unless the entire thing is packed with algae.
Yeah, I'm still north of you. If you want to get the max nutrient export out of your HOB refugium, I'd ditch the rubble for more room of caulerpa. Some rubble won't do much if you have 1-1.5lbs of rock per gallon.