**make sure it doesn't get drop eye, as it is fairly common among larger arowanas.
**be sure not to feed minnows to it, as they carry black-spots disease and once it gets it, you can't get rid of it...it may take years for it to disappear by itself.
the barbels don't grow back so be careful with them. silver arowans that don't have them look incomplete.
Make sure you get a much larger tank soon. your fish can get holes-in-the-head disease, gill curl, and even tail/back curl if you don't have enough space for it.
I don't recommend you putting any other fish with your silver as your tank is small. and over crowding can lead to more diseases and ammonia burns - to fin rot.
get a powerful filter when you get the money. XP5 is awesome!
feed it frozen foods: shrimp(take tail off, as the sharp points can penetrate the fish's stomach),tilapia, smelt, silversides, krill, and at times - beef heart.