I have a large closet in my room with a water heater I've cleaned out to put my tarantulas in, as it's much more practical than where they are at now. Our water heater is also in the closet, and I noticed green and white corrosion. Which from what I've read is calcium, sodium, and low pH levels in the water. My main question is, does anyone know if this could be somehow toxic to the tarantulas? I'd rather be safe than sorry, thanks for any advice!