I have a Red SEa Berlin Airlift 60. Same type but a little smaller.
The airstones used in this are limewood. It takes about 3 days for them to soak up the SW
very well. When I replace my stone, the air bubbles will go all the way back down(just like pic on R.) I have to adjust my air pump down a notch or 2. But, as the airstone increases it content of SW
, you will notice the bubbles NOT going all the way around.
Sounds like you are starting a cycle for a new tank. Correct? This was not mentioned, but sounds like it. Anyway, you won't be getting much skimmate right now, if you are cycling. Most of your skimmate production happens at night.
In your picture, the one on the left is what you want the skimmer to run at. If you go with the right sided one, you will get too much white foam in the collection cup. Also, many bubbles will escape the Berlin and get out into the tank. After you have fish and corals added, you don't want little bubbles floating around. So, adjust your skimmer buubles accordingly.
Once you have the skimmer adjusted correctly, depending on what inverts and verts you have, you will notice a liquid that kinda resembles green tea. It will smell like the lake shore during summertime. If this is what you get, then just clean the collection cup every 3 or 4 days. No need to ever adjust the air pump again. Replace the airstones every 30 days.
29gal BB | 42+ lbs LR
| 143watts PC
| Asst. Leathers, Frogspawn, Hammer, XLG Open Brain, Zoanthids, Mushrooms, Diploastrea heliopora | Blue Mandarin | Atrosalarias Fuscus | Pair Captive Bred Ocellaris Clowns | Peppermint Shrimp | 6 Astrea's |