Is this a myth

[JonL]

Books write that direct sunlight will have a negitive impact, mytank ran for almost a year and no temp flux and no aglea out breaks. My tank did acumulate a slight green colour in the back side of the tank in the sediments but it was not visible from the front

[ReefDiver]

So, what's the question? There are many myths floating around this hobby. See Eric's articles in Reefkeeping magazine.

[Fredfish]

Light is light. I believe the sun was generating it long before we invented lightbulbs.

Yes it can heat your tank, but in your case that was not an issue.

I grew great algae under 250w metal halides :rolleyes:

If it works for you, don't sweat what the books say.

Fred.

[G-money]

The issue may be mostly that you can't really control it.
If it's causing algae outbreaks, the sunlight is not your main issue.

I have had tanks get morning or evening sun with no apparent negative effects - though I had no control set up ;).

I think it's largely a myth.

[pch90265]

Read Anthony Calfo's book, "The Book of Coral Propagation." He describes his multi-year efforts at growing coral in 5000G of tanks in a greenhouse under direct sunlight. As was indicated, this is how our inverts grow in the wild! With enough nutrient export, and efficient herbivores, sun should be a GOOD thing for our tanks...

--SM--