[gnome] xpenguins as Startup Application

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http://ubuntuforums.org – I'm trying to add xpenguins to the Startup Applications (power button -> Startup Applications in 12.04). I've put "xpenguins -n 12 -d :0.0 --all" into the Command area for Startup Programs, but xpenguins doesn't show. When I boot up my computer and log in, I can see the penguins for a little bit, but then once everything starts up they disappear. I can open the System Monitor and see xpenguins still running, but I can't see the penguins on my desktop. I think the problem is because the penguins are getting sent to the wrong display, the display that's there before the normal di (Hardware)