So I finally figured out my cycling problem and now my 10 gal is ready. Ammonia and Nitrites at 0. Nitrates are still super high, but I still need to do my "big" water change before I add any fish. Nitrates have to be at around 15ppm to start adding fish, right?
This tank is divided for 3 fish. Should I add my fish one at a time every certain number of days? Or can I just add all 3 in at once?
Now that I'm done, how do I maintain the tank after adding my fish? Is it like 25% water change once a week? Something like that?
Subtrate: mix of gravel and sand.