Reddit mentions of Polar Pro Red Filter-GoPro Hero3 Version-Acrylic Edition Accessory

General GoPro advice:

• In saltwater (blue water color) you need a red filter. Here's your cheapest option: http://www.amazon.com/Polar-Pro-Filter-GoPro-Version-Acrylic-Accessory/dp/B00B2PHSIY
  
• In freshwater/lakes (green water color) you need a magenta colored filter.
  
  And, some specific advice for your Hero3 Silver:
  
  
• 30FPS will look better than 60FPS because the camera will get more light exposure per frame, improving your image. If you are planning a dive deeper than ~50ft or so in all but crystal clear waters with bright sun, I would shoot in 30fps.
  
• For the same reason as the above, you may get a better exposure shooting in 720p than in 1080p. The Black Edition cameras and newer 3+/4 cameras are better at these higher resolutions in low light conditions, due to a better sensor and other improvements.

Or, even simpler. Use a filter. Works like a champ.

I am doing some underwater stfuff as well. Here's a few things that I purchased:

the bobber

red snap on filter

go scope

And a shameless plug for my first tide pool video shot last weekend.

Its US Amazon. Not sure the equivalent in Norway

http://www.amazon.com/Polar-Pro-Filter-GoPro-Version-Acrylic-Accessory/dp/B00B2PHSIY/ref=sr_1_3?ie=UTF8&qid=1414955142&sr=8-3&keywords=polar+pro

For comparison, here is my gopro video from Hawaii when I didn't use a filter.

https://www.youtube.com/watch?v=bcJBeXzZ8gE

Awesome video! A few things though

1. You should use really use a red filter.
   
2. How did you rig it to the chum?
   
3. How long did you leave it down there?

I use the Polar Pro Red Cube Filter. Snaps on and off easily, adds great color restoration to the videos I take. No complaints.

http://www.amazon.com/Acrylic-Filter-Tropical-Correction-Scuba-Diving-Hero3-Accessory/dp/B00B2PHSIY

I got one similar to this

Worked great for me, here's some screen grabs so you get an idea of what it's like, I chose to just leave it on at all times rather than risk taking it off for topside and loosing it

Above Water

Shallow Water (around 10 metres)

Deeper water (around 20 metres)

Deeperer water (around 32 metres)

All images are RAW so with a bit of colour correction they look quite nice, think my next investment will be a nice dive light to go with it.