BUG would be a greenish brown liquid. It would 'eat' PLNT and WOOD. If there was PLNT on the simulation, then each particle would only flow towards the PLNT, unless it was between multiple PLNT pieces, in which case if would move randomly. If there is no PLNT, it will have the same behaviour with WOOD, and if no WOOD, it would flow randomly. It would become ICE under 0°C, and would be destroyed if the pressure is over ±3, or the tempurature is over 70°C.
Hummm, I don't know why, but I love the idea. Maybe add "reproduction after eating" or "turning into GAS if temperature too high" capabilities for some stupid, ahem, bioreactors? Even without such exceptional addiction to plants, just moving randomly.
(I remember about yest, but this will be a little more fair, maybe?)
Decent idea, but we would need to reuse the tron ai and we would need to remove the up and down movement from the tron ai!