Will extra sunlight through sunroof cause problems?

chuckdallas

Tank Tinkerer
A friend on the Florida Marine Aquarist Site (FMAS...local club in south Florida) mentioned he has the frag tank connected to the display tank with pipes through a wall. The display tank faces the kitchen (toward the interior of the house). The frag tank is in the air conditioned portion of the house, but in the section that "could" be a patio. It's actually called a Sun Room, which has large windows and gets lots of light during certain times of the day and certain parts of the year. He has developed large amounts of hair algae all of a sudden in his frag tank and he was wondering if the large amount of sunlight in that room could have caused it.

That brings me to my question. I have 3 very large sunroofs over the 30 foot ceiling in the living room. During this time of year, the sun comes up at just the right angle to put the full midday sun on the left half of my peninsula display tank toward the living room. I had a new rock of blue zoas and they weren't responding (opening) so I was wondering, will the addition of direct sunlight (in addition to my two 60 watt LED pendants) cause the corals on the left side to react adversely (stay closed or bleach out)?? The direct sunlight only goes on the left half and for only 3-4 hours this time of year. I have a nice vertical screen, like the ladies used to change behind in the Western movies, that covers the external overflow box and pipes for the wife and when guests come over. Should I move that vertical screen so it blocks the direct sunlight? That sounds crazy to me, but after Todd's hair algae problems (my buddy above), I'm wondering if I need to keep the light levels at what the corals are used to for the last 2 months.

Any suggestions??
 
I think the GHA might be associate more towards his water chemistry? PO4? Also I thought Sun is the natural lighting??? maybe the time of the day..i dont know
 
The sun will cause more algae to grow if the water quality is bad. If you have clean water sunlight will not grow algae because there are no nutrients for it to survive.
 
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