I agree with justchillin's idea of just waiting until you can afford a larger tank...
here is so info on your shark!:
These are among the smallest of the aquarium suitable sharks at about 40 inches. Adult Bamboo sharks can be kept reasonably well in a 125 gallon or larger aquarium. Be sure to keep the Bamboo shark in a relatively wide tank (24") as they will need the width to move comfortably when they get older.
Distribution:
Indo-Pacific Oceans
Diet & Feeding:
Feed all kinds of large meaty foods like small pieces of fish, squid, shrimp, and live goldfish.
Aquarium Behavior:
Aggressive towards anything small enough to fit in its mouth.
Inverbrate compatibility:
Not recommended, will eat shrimp and mussells, and destructive to corals with age. Aliases:
Banded Cat Shark
Length:
1000mm/40" (wild), 1000mm/40" (aquarium)
Temperature:
78°F - 81°F
Salinity:
1.021 to 1.023
HOPE YOU MAKE THE RIGHT CHOICE!