Hi Ho.
I performed a search for "Strategy" looking for an appropriate thread to post some tips, and this one came up. If anyone knows of specific threads on strategy for specific factions (Gaians and Planet Cult in particular), I would greatly appreciate the link.
Anywho, I agree with Russia4Life's comment about late game fungal blooms... they're basically a cash cow that gives approximately 2000 energy credits for each stack of 30 or so mind worms killed.
Playing as the Gaians with a +6 Planet rating, I found that placing at least 2 Elite Psi Hovertank with anti-grav struts (5 movement/attacks) and the SAM ability (for Locusts) in each city producing eco-damage more than adequately provides protection against mind worms. I found it curious, though, that a land-based unit can defeat an entire stack with just one successful attack while a copter must defeat one at a time.
I remember years ago on at least two occasions (playing the Gaians) where I attacked a Demon Fungal Tower with one of my own Demon Boil mind worms and captured the entire stack of approx. 25 Demon Boil mind worms that shared the same space. The tower remained until I destroyed it the next turn. Has anyone else experienced anything similar, since I have not been able to recreate this feat since.
On a separate note, a strategy I use whenever I discover an Ogre is to use it to investigate Unity pods in the hope of getting the clone effect. It would be accompanied by one of my mind worms set to Designated Defender in case it produced native mind worms (which would wander off without attacking). In one game, I had managed to collect 9 Mark I Ogres within 30 turns, and 3 Mark II Ogres by mid game. Still have yet in over 10 years of playing to find a Mark III, though.