| The tank will house it for a few years, depends on how much you feed it will depend on it's growth rate. The more you feed it the quicker it will grow.
Water temp should be mid to high 20's and air temp should be high 30's.
We put uncolored gold fish in with ours, around 5cm's in size, they are cheaper than the colored one's. They get along fine, the croc leaves them alone until it's hungry. Then it eats some...they are good for activity and exercise, it gets chicken necks and rats & mice as well. | 
