Want strategies for seiging a planet

[Stone Mill]

I like to use medium or large transports...

ECM III
Stealth and Scattering III
Lots of extra armor III
Solar sails III
A few point defense.
Maybe a weapon or bomb if I feel giddy.
Usually trained 20% in a 20% fleet

This gives your invasion vessel some quickness, defense, and survivability.

Carry a small sample of every breathing type for instant exchange.