Hi guys. I have just spotted these little things in my tank. Does anyone know what they are and if they will cause problems? I dip everything that goes into my tank so I'm really not sure where they came from. To my colour deficient eyesight the look green but I could be wrong. I'm really hoping they aren't a big problem. They seem to have come out of nowhere, I look at the tank every day and I didn't see any before today, but there are a good few in there. I'm going to start siphoning out as many as I can now.