Small Sulfur Cubes Only Grow if Near Potent Sulfur

To make the mechanics of the sulfur cube more logical, have it so that the small sulfur cubes only grow into the larger ones if they are near a potent sulfur block. It would follow logic that the sulfur deposit from the block is being absorbed by the cubes and over time they accumulate enough mass to become larger. This would let players keep small cubes as pets or for atmosphere in a way that I think is both more logical than using a golden dandelion and further in line with the mechanics of the existing slimes and magma cubes.

As a potential smaller quality of life feature, it might also be nice to have the small cubes emit the green growth particles if within the growth radius of a potent sulfur block similar to dried ghasts in water. This would be a good visual hint to new players still learning the game.