So I did the same dark start, and copepods/fish..... I had a sand bottom (oolite, highly NOT recommended) and did dry live rock (?) it was in a dry box so well call it dry for intents and purposes.... I waited maybe 2-3 months before adding fish. I was positive I skipped uglies. I turned lights on and waited another couple months. I didn't have anything other than a couple diatoms in the sand. So I started adding more.... another month or so went by, and everything was beautiful and thriving. Give it another month-ish, and boom algae outbreak like crazy. Killed a bunch of things off in my tank and I was ready to throw in the towel. I kept with it (mostly because holy investment, I cant back out now) and now just shy of 1 year, I'm just starting to conquer the battle on algae. I finally have stable parameters (even though I thought I did before). So I would say somewhere between day 1 and 1 year......final answer.