I am building a livewell to keep bait in at the house that can be put in the back of my truck. It started off as a 55 gal clear plastic drum that I got from work. I cut it down a little to make it fit better. It still if around 30-35 gal. I was wondering about if it would be better to paint the outside or not. I know that fish like it to be darker inside but will the dark color paint(black) attract the sun's heat more and heat the water more to offset the advantages of the darkness inside?