+99999999999. A small nano isn't suited for a mandarin, unless you have a 70gal refugium filled with rocks and cheato hooked up to it. Even if it eats prepared food, it can stop eating it out of nowhere. I've seen people who owned mandrains died of starvation because they prefered the taste of pods
instead of pellets or frozen fish food.
Even if the tank is a year old, a mandarian would wipe out the pod population in days for a nano tank. Unless you are into pod breeding or willing to buy live pods
every 5 days for as long you have it, I'd say save your money and pass on it.