I have some black dots on my aquarium filter return inlet and on some of my driftwood. I dont know if it is snail eggs or what. I have a snail infestation but that does not bother me. 120 gallon tank so total break down and clean up, especially since i just did that 2 days ago, is something i am trying to avoid. Not in a panic yet. anyone know what this is give me a shout.