I am using an Alita AL-15A linear air pump for my six 30G tanks. I use the Poret foam as a corner Mattenfilter with 3/4" uplift tubes. I have air to spare, so I bleed some off. I have found this air pump to be extremely quiet and am very pleased with it so far.
There appears to be so many variables when choosing which air pump to use. Depth of tank, whether or not an airstone is used, # of tanks, distance from pump, supply header size, etc.
Hope this helps,
Dee