Yes just enough to move it. Don”t have it bubbling away like a witches cauldron as if you do it will take longer to mature & you will probably have lingering Nitrite for a long time.
In fact I prefer to have the air pump feeding it on a timer so that it is only aerated for 30 mins a day.
This way it seems to mature a lot quicker & Nitrite dissappears a lot quicker & the 30 minute aeration is long enough to stop mulm building up in the bottom of the outer bio chamber.
6,250 gallons, block & f/glass, aerated b/d, skimmer, nexus 300 & nexus 200, sand filter, 2×55 watt uv, 2x40l air pump, gas heating, 4 pod purifier, autofeeder