When you first get the slime, it has 0 mana to become a fire slime, I gave it 3 mana stones to get the transform, and an extra one for good measure, both at 6 and 8 mana pre-transform, the fire slime has had 30 mana, regardless of fed stones.
Unless I'm an idiot and the fire slime from a 6 mana blue slime has 28 mana, I'll have to double check cos you got me doubting myself. I'll test again soon, my current file doesn't have an elemental slime yet because I was going too fast lol
