How many lights would you use on a tank?

[Doctorgori]

I seem to always have vid issues, prolly this ipad….anyone else getting the vid?

 

[Sean Clark]

I can see the video on Android and win10

 

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[Gtinnel]

I can’t see the video on iPhone.
To answer the question in the title I have 6 lights over my tank, but the answer to the question will change greatly based upon the type of light and the size of tank.