They are beautiful fish, and I've honestly made impulse buys myself when I first entered this hobby. Shame on me for that, and shame on the LFS (to an extent) for selling me the fish. You are learning the same lesson many of us have. Just make sure it's a stepping stone for all future purchases, and you'll be fine...
That being said, with all honesty, you have an up-hill battle with that fish in such a new tank. Even with your tank being aged and a thriving pod population, that fish will likely eat more pods than that tank can produce daily.
I have a 225g tank with about 250 pounds of LR, and I have added about 9,000-10,000 pods to my fuge about 6 months ago. I see pod molts floating around my tank daily, which means that I have an established pod population. Still the same, I'll wait another 6 months, or so before I add my mandarin to the tank. I want the pods to have a self-sustaining and reproducing establishment in both my tank and my fuge before I add my mandarin. They literally eat all day, and frozen foods are only supplemental.
I said all of that for a reason. Pods live within every nook and cranny of LR that they can. 40 pounds of LR simply doesn't provide enough hiding places for a pod population to hide, live, eat, reproduce, and hide again until they reach maturity to produce the next generation of pods before being eaten by a mandarin, or scooter in your case. That fish will literally pick your rock clean within hours...
The best advice I can offer is to trade that fish back in...
Best of luck!!!