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I've got to agree about having a mud snail waters only set up is the way to go. I did the 409 treatment a couple of times and it is amazing how much 409 is required and how much time it takes... it also amazing how many snails are present in the water! I was over at Putah this week and I was having a slow day, but I saw lots of very small BWOs or midges (I think the latter) coming off, so I decided to seine the water. While I didn't get any good samples of the bugs hatching, I got quite a few mud snails! No rocks were turned over, just flowing water.
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