Yep, time is your friend. These kind of bacteria blooms are not a threat to anything other then decreasing oxygen levels, so make sure you have plenty of surface agitation. I have heard uv sterilizers will help the process if you really want to speed things up but I personally I have not used one.
A UV sterilizer will take care of the problem in 24-48 hours, however it will come back if taken off line and the root problem still exists.
As others said above, time is your best friend and it will eventually pass.