Water with potent sulfur can cause damage and turn green.

I suggest that water above the potent sulfur block should change to the biome's greenish color and deal 1 to 2 hearts of damage to the player, along with nausea and particles. This would make the environment visually intuitive and truly dangerous, as sulfur is toxic. Additionally, it would be great if this toxic water could be collected with a bucket as a new liquid.