A Jar has a more aggressive nature, and I can't tell if that tank is good or not, you need to provide the dimensions of the tank it's those that make the difference for aros not the amount of gallonage.
Jars can reach well over 20" they can grow to about 3' (36") long and being more bulky than a silver or black they actually have more trouble turning than a black or silver would.
Jars can reach well over 20" they can grow to about 3' (36") long and being more bulky than a silver or black they actually have more trouble turning than a black or silver would.