When humans made first contact, they were attracted to the system by energetic anomalies. This was actually communication, transport and broadcasting infrastructure, and they had well anticipated the arrival of another sentient people. Eventually it was discovered that Aquarii had a form of interplanetary travel – with their modulations they’d developed a way of creating wormholes for individuals and groups. They expanded our network of habitable planets, and they welcomed humans to their own system once they’d examined this new people thoroughly. The society of co-evolved Aquari/Symbias planets was more like signal beacons and lighthouses between different kingdoms with the occasional small party of emissaries.