You might want to do something like this to keep kelp polyps, grass and crap out of the intake tube of your new bait tank. I used pure silver wire bought from a bead shop so it won't corrode. Not as simple as a screen, but I like the way it looks and works. I know it won't fall off.
Also, be careful of the collar around the outflow tube. It can come loose if your not careful.
Wayne