Hey Brett.
It should only be very temporary as it will swing very quickly to acid. I am a little concerned about the use of urea as a starter for Nitrosospira sp. Indeed it works but the risk to any live stock is a tad high. Personally, I prefer to let nature do what she does best. I throw a handful of soil and piss in the filter and all works out nicely. Once it is kicked in, it is relatively difficult to kill it. Temperature, fertilier and pH will have an affect on the start up Nitrosospira sp. The autotrophic nitrifying bacteria will have very high competition from heterotrophic bacteria on start up until your media is conditioned to establish habitat for the goodies you are chasing. The difficult part is the urea will not provide all the nutritional needs and will deplete very quickly after hydrolysis of the urea.
Anyway just me rambling.



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