I'm reading in the codex but I'm a little confused, it say's that spores will explode if they come withing 2" of a unit that fires or if they come into contact with them. Does this mean that if they drift around and hit (or explode) on a tank, they become 1/2 str because the center of the blast hole is not over the model (it would be over they biovore). I was also curious b/c it says that bio-plasma has 2d6+3 vs tanks, but it doesn't say that the +3 comes from the weapon S3. Although I am pretty sure this is the case, can anyone clarify?
Also, do Biovores count as artillery, as in they can be shot out without taking a leadership test if not the closest unit?