A full grown tire track is little less than 1m takes about a 18 months to 2 years and mine enjoy's blood worm , earthworm's and maggot's but not to many as maggot's are a bit fattening.
My TT eel is about 14-15", he eats blood worms, earth worms and any fish that can fit into his mouth(I provide him with a supply of convict and firemouth fry)