Looks like fun, we stuck a line out a few weeks ago on a trip down to Port Huaneme but didn't get anything. I guess I'd have to go buy a dedicated tuna rig.
There's a limit but I am quite surprised that the number is high as 25. Also, I heard there was radiation from the Japan's quake detected in tuna found off here, so should be tasty.
As for your tank looking boring, you could always add a few angels.