I have these little clear circles all over the glass of my tank. its actually i'd say about 90 of them maybe? i tried to count, but there is way to many. anyway, the clear circles have about ten white dots in each one. Someone told me they were a type of snail egg, but i'm not sure. Does anyone know what they are? They've been there for about a week? and whatever they are how long will they take to hatch, so i can clean my glass that is quickly turning to green. thanks.