We have had tank for 8 weeks, but was set up from an existing tank taken down and put back up same day with a 30 gal sump. Have had problems with nitrates, been running around 40 ppm. Started dosing with Nopox about 2 weeks ago.
We have LED lighting and leave it on probably longer than we should.
I have heard it can poison water if it goes bad, but not sure when to pull the plug as some of it still looks healthy.