I have hundreds of them in all my sumps. They came from live plants I bought at petsmart and they've multiplied for a long time. They are terrible and I want them gone but I don't know how to get rid of them. They range in size from the size of a ball from a ball-point pen, to about the size of a small bee-bee. They eat all my good bacteria and my nitrites have been insanely high because of it. IT recently killed my jurupari, clown knife, and two dragon gobies... Sad day...
If anyone can ID these devils and tell me how to rid my tanks of them, I'd love to hear any advice you have to give