If you've played Space far enough you will find green Space Eels swarming all over your rocks. Left unchecked they will consume all the water in your system. Currently your only recourse is to hunt each… Well you'll figure it out. Anyway, I was thinking that there should be something that would hunt the eels down for you.
This is just an idea I've been kicking around but say the technology to control the eels could be found in the eel's home system. I was thinking that the eels would be from somewhere in the Gaia sector. The Gaia sector of course would be the center of biotechnology.
Perhaps you would have to go to their home system and use the tractor beam to tow an eel predator back thru the jump gate to your home system. Once in your home system it would reproduce and keep the eel population in check.