Cloud tank?

[WhiteOpus]

Anybody here have any experience with using a cloud tank to create special effects? I just got a 20 gallon fishtank to try my hand at making some cool b-roll imagery for a music video. What works the best to create the "clouds"?

Also if anyone does have any experience, how did you avoid a reflection on the back wall of the tank?

 

[Will Vincent]

Black out the back, use milk or cream for your "clouds" That way you'll be able to pull a key easily, and colorize too since it'll end up being black & white.

This is a decent 'how to':

https://www.youtube.com/watch?v=uHVGX7CSt_Y

 

[WhiteOpus]

Thank you very much for the reply Will!