Mateo: It sounds like you ...

Mateo:

It sounds like you might have had this pop up quickly.  If so then it might have been due to a quick temperature change.  To minimize impacts at this point with no use of NaOcl then try using a water spray to get the Nocardia down into the water and let the bugs eat it up.  Reduce the amount of air since that is what Nocardia thrives on.  once the foam is reduced then get the correct amount of MLSS into your system.  Keep it balanced and it will ride thru the temperature changes.  

Keep your bugs happy and everyone working there will be happy.

good luck sir,

Lyman Waller