Keep some pressure on Pi Circax so that he doesn't start sending fleets off to other planets. You might also want to make a little scout ring around him so he can't slip anything by you.
Also, hello Addridae's other account! Just noticed your scout has finally reached us
I'm keeping blackbirds and scouts flying around Pi Circax, but I can't afford to send a real military detachment. I want to take Nu Fornpeia without any margin of uncertainty. He has 50 cruisers. I will attack him with 150. Nu Fornpeia being captured, I will begin building another fleet and, with it, I will take whichever planet seems best to attack next.