Polarizers

[KevinK]

polarizer's are great in general, for outdoor, it makes pictures warmer and gives them more depth.

nice thing is that you can turn it to your liking

I kind of use it all the time, as kind of a UV filter on my camera, I never used it when taking pictures of my tank, but I asume it wil take 90% of your reflection away.

only thing you have to watch out for is movement of your camera, as there might be slightly less light in a tank picture, but try to lower your shutter in that case, worst thing is getting the tripot out