depending on your location prices will vary. In new york youd be getting ripped off for a common wolf for that amount of money. If you feed them live their growth rates will be quick, if you get them to accept sinking foods and pellets growth might be stunted, but this would be totally against the nature of the wolffish in general. You can try live plants but they will probably just get ripped out during nocturnal hunting, better bet might be some fake heavy-weighted plants once it gets larger. Keep one per tank and choose tankmates carefully, wolfs can be quite a handful.