When I was cleaning my GTF cage today I noticed some small white bugs running around. There were two different types, on was round and looked like some sort of mite, the other was longer and skinny, kind of like grain of rice, they are both about 1 mm long. I couldn't get a picture because of their small size. If anyone has any idea what they could be and if they're harmful or not that would be great. The substrate in the tank is peat moss, I have a pothos plant and another plant that I don't know what type. I have some sticks from outside in there. Is that how the could have gotten it?