Feed mode on the Gen 1 is 1000 rpm, if you have Gen 2 the feed mode is 500 rpm.

The big issue the guys down here were having with the battery backups during the power outage is that when the battery backup comes on, your pumps automatically go to half of your current setting speed (similar to Night Mode) and hey were not getting enough surface agitation for oxygen exchange for their fish. The guys who also had battery powered airstones did much better.

The big gripe was that the selling point of the battery backup was to protect you during power outages, but it turned out to be a false sense of security.

(I have a MP40W on my 90g and love it! but don't have the battery backup)

Richard