If you not trying to run ULNS I suggest you to go a different route than carbon dosing... my personal experience is that with the carbon dosing sps do well but zoas and lps were a bit harder to deal with.
You should try to figure it out where the nitrate came from, if water changes doesn't work you must have a kinda die off somewhere ...
did you try to use a different a Nitrate test kit?
About brightwell , yes they recommend before putting the brick in the sump/tank to seed the brick overnight in some aquarium water and some MB7...
I had good experience dosing with brightwell, but my glass had to be clean everyday but nitrate and phos were super low.
last 2 months I'm using AF and have to say nitrate and phos climbed fast but now after a few WC and putting back zeolite in reactor the value are getting back down and under control . Not sure if the values going up was due it to the switch to aquaforest.
One more thing of the 3 , the zeo it is the only one that not need to run a phos absorber media , like Rowa phos for example...
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