If you have ammonia, then this is a problem and you need to wait. With all of those fish, the nitrates will likely always be high, but you might need a while longer or the fish will die of ammonia poisoning. I don't know what booster is, but if this tank was set up before, it has all of the bacteria that it needs and just needs to grow to an equilibrium.
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Unfortunately the tank was rinsed off and most likely killed the bacteria. I kept 20 percent old water, and 80 new. I pumped the 55 gal with old water and moved the fish in. I then put a few decor in their from the old tank. Since then I have planted one (dead)coral drag covered in the refuge