Try different light colors of highly reflective paper. In stage design we always have to mix three different gels to make human flesh look natural (pink, blue, amber) and it's pretty much the same when viewing colors through water -- clear or cloudy. You should be able to find a very lightly colored, almost faded color paper -- maybe off white, yellow, light blue -- that should read as white. Good luck.
In my opinion, the light needs to be closer to the white background so it comes out as white in photos. You can actually see a line halfway through where some light starts to hit the background. Most photos you see in contests with a white backgroung actually have a backlight that hits a white diffuser.
the paper is just slid under the plastic rim on top and bottom and then taped on the sides. I see people with white background on normal goldfish tanks that look white. even on the bottom half where you can see the light hits it better is still dull grey looking.
The glass and water itself "color" the white background. So does the lighting itself (depending on bulb Kelvin).
I believe a glossy white background would be more reflective, appearing a brighter white in comparison to a matte/flat white.
If you just had to can't find a proper white vinyl background, I guess you could paint the glass white, not too hard to scrape off glass if you want to change later.
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