SURVEY - tank back color -

[MarkO1]

I've used both black and light (sky) blue and I honestly think the blue looks more natural and happy, even though the black background tends to show the colors better.
But remember it's pretty easy to change, whichever you decide...
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Ferrari 195 Inter

 

[John 3:16]

mine is black

 

[Chucker]

A thought on mirrors..... Territorial fish may not appreciate them as much as we do.

 

[derek_drennan]

Dark Blue!

 

[KanUCme]

Black