erk628
Fish Herder
No problem that's what were here for to help others and learn. I have the same probelm with the one tank I have an air rock in. As long as your filter is causing a little movement on top of the water then the air rock isn't needed if you like it though I would leave it just when you do your normal weekly water changes take a paper towel or something and wipe that off. Tommorrow when you do your next water change you may want to stick the gravel vac down in the gravel once just to see if it bring up some more dark greeen stuff. If not then you can just do a water change without vac the gravel. If darker green stuff does come up id vac the gravel again so you can get that stuff out of there. I have sand so I don't have problems with stuff like that getting through it just stays on top. Keep us updated on the water