Yes i am using botom diffused aeration have 2 9 inch diffuser. Water dept is around 7ft. Not sure about the temp of the water. I notice a lot of alge along the waters edge was wondering if i need to start it up. But we have another cold spell coming this week so might be better to wait. Just did not want to hurt the fish with early start up. Do FHM stay along the surface in schools most of the time. This was another reason that i thougt that i might need to start the areation going.