How to reduce/remove reflection from tank silicon glue?

[Shadow]

How to reduce/remove reflection from tank silicon glue?
My flash setup are: light box with 580ex from the top, 2 x 420ex from the left and right glass wall side. What happen is the silicon glue from the from glass wall reflected by the back glass. see below picture.



I tried pointing the 420ex to different direction but it doesn't help. Any sugestion?

[trident]

remove the silicon?

[Shadow]

paint it with black color

[CK Yeo]

I thought you were going to do your gradient blue background thingy?

ck

[Shadow]

no success

The CAU method is out because no space behind the tank. I was trying to print some blue gradient in photo paper and stick it on the back but not a success experiment as well. When I start creating ripple on the surface, you will start seeing shadow at the back, make it look weird. Tomorrow will try other method by putting blue background on room wall behind the tank (not the tank wall).

By the way, the white shadow is always there regardless what background I used.

The photo I attached on early post is by pointing the side flash to the wall behind. The shadow is more prominent if I pointing the flash side way or to the front.

[mad_tunas]

Polarized filters might help reduce the glare.

[Shadow]

hmm... yeah, I do have polarize filter but didn't think of that at the time , thanks.