Some help with me 5 foot deep marmite session.

After the success of my 5 foot deep tank of treacle session I want to go further and try marmite.
I am almost ready to start sessions but need help with camera quality, as you can tell from the picks my finepix camera is very poor at taking these sort of pictures, so any ideas on how to make it better, my last resort is to buy a new camera, any ideas would be very helpful!
I am almost ready to start sessions but need help with camera quality, as you can tell from the picks my finepix camera is very poor at taking these sort of pictures, so any ideas on how to make it better, my last resort is to buy a new camera, any ideas would be very helpful!