Once allied with them you can beam down with your hologram and they will sing for you while your walk around outside their city. You can also avoid the social suicide by buying off your enemies at 12 million each. They also seem to like it when you use the AOL repair button over their cities. What spore needs in advanced gameplay so you can be assimilated with the grox, (like the borg), they become you and you become them.
But don't they civilize back on their planets again? My technique is trying to get a planet to at least T1, and bring the same set of plants and animals in mass amounts to just stabilize the Tscore on their planets so they can't come back.
Damn, I sure hope there aren't any Grox-like creatures in our galaxy. Just think about it: the Human civilization reaches its full potential and then BANG, you realize that you have a galactic bully in the middle of the Milky Way. That would really suck.
I find that if I find empires near the grox I form alliances and pay them to attack. This works great because they can move along with you. I also add colonies along the grox border so I can have and idea of what I am dealing with
oh i forgot to tell you what i find of the video so far this is hte most helpfull video for information about the grox ive seen ill give you five stars for this since i now finaly have the dance with the devil badge :D