Several years ago I had a 55 gallon with just a HOB skimmer and HOB filter; that tank had hundreds, if not a thousand bristle worms. I still have that tank today, but it has much better filtration on it, it's going on 9 years old. Now it has maybe a couple bristle worms. So, I've made all the mistakes, too. That tank sure did breed thousands of snails, mostly Stomatella. I would attribute the build up of detritus, because of a lack of filtration, to be the main cause. Didn't take a lot of pics back then, here's the only one I could find. See there's a bristle worm in every crevice? Guess the photo was taken in 2008, so it seemed longer ago than that.
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