According to @Randy Holmes-Farley nitrite isn’t harmful to the fish and you’re good to add them.I went from the aqua one mini reef 215 to the Cade pro reef 1500 s2.. both are still running I just wanna get my fish moved into their new home.. I’m not sure about my nitrites being 0.5
For some context I added my 3 fish to my new tank about a week ago with elevated nitrites and they’ve been 100% fine. I’m just monitoring nitrate to make sure that doesn’t get too high and doing 20% water changes weekly until the nitrites die off