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Light Shy?

As I have said many times before, I have a number of
the "Colombian red tail tetras".  All sizes from
barely visable up to 1.5 inches.  

Here's the thing.  Since I got the PCFs, most of the
adults are hiding a lot.  They aren't nearly as
aggressive when feeding anymore, much to the delight
of the tank's more placid inhabitants.  But, the
juveniles don't hide much.  

I don't know if it's because the tank lid slammed down
a couple times when I was working in the tank, a
territorial Apistogramma nijsseni (doubt it.  hasn't
been a problem in the past), or some super bright

Has anyone else seen anything like this?  What are
cardinal tetras like in really bright light?  I'll bet
they look better in partial shade.  

Thanks, Cavan

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