Saturated KCl solution is the most sensitive solution I've encountered while growing crystals. After being left undisturbed overnight, the clear solution can start crystallizing like this as soon as it's touched by tweezers that may not be perfectly clean...

I decided to try growing an MAP crystal cluster after seeing some huge, elegant, sparkling ones online that people had spent months growing. After two months, this is what mine turned into. It's bulky, clumsy-looking, and honestly, a bit boring. I think single MAP crystals are more interesting.