I recently had a new 270 gallon formed pond installed in my Pond garden, along with a pallet of bags of cocoa bean crushed mulch from a candy factory in Chicago. After the new pond installation & laying of the cocoa much ( a few days later) we drained the pond to clean the dirt from the install. During the draining, as I was emptying the shop vac, I discovered thousands of itty bitty white worms that jumped after dumping onto the ground. We scrubbed the pond then refilled it with water. The next day I noticed a layer of white stuff on the shelfs of the pond. I took a net & scooped dead teeny tiny white worm like things out. Now the entire shelf is lined with these dead, icky things. I've not noticed any on the mulch, just in the pond & in a huge ground bird bath I have. It's not in any of my other pedestal birdbaths. My question is....Will these things die off during the Winter months in northern Illinois? They are so disgusting. Thank you