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Red/Orange Algae

>I've got something I haven't seen discussed here yet.  On the back of my 
>90 gallon tank I've got some algae growing that is a bright 
>red/orange.  Best viewing is from the side at about a 45 angle.  I've 
>seen this before.  If my memory serves me correctly, the algae will be 
>green again in a day or two.  I assure you the color is not reflected from 
>something else.  Anyone have any ideas?