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Thanks for that, your wording is better than mine by far, you got to the point, but I was pleased you confirmed what is my experience and understanding. Thank you zoidburg! Simon

Wow, and they appeared suddenly out of nowhere! I ended up restarting the entire tank since they were multiplying and eating all the food. Also, the worms looked scary and many!

Or suck them up during water changes with a hose, being careful to avoid your shrimp. Just got to keep catching them. Or you empty the whole tank and refill. They are harmless, and it probably means your water parameter is perfect. They can be like a canary in the mine shaft. If they die first, you know something is wrong with the water.

Yes, Simon. If by using RO/Distilled (or, as you have, "Zerowater"), you know exactly what is in your water when you add minerals back in. Tap water could have chlorine, chloramines, pesticides, flouride, copper, fertilizers or who knows what else. You can get the water tested to know exactly what's in it, but you're kind of better off just going the RO route and not having to question if the tap changes due to seasons or whatever chemicals are used or what have you. Even if you are living on a well, it's not guaranteed better than city water because it could still fluctuate or get contaminated by something. One person mentioned that they lived on a farm and had well water. Neighbor up the way used fertilizers or something on their property. It contaminated the water system and their tank crashed...