reefboys
Member
Alright I'll do my best. Parasites such as ICH are atleast remotely present in nearly every home aquarium system. Fish's immune systems prevent these parasites from causing problems. When a fish is a tank that is too small they get stressed like crazy. The stress causes their immune systems to hit the fan pretty quick in turn allowing parasites and other diseases to infest their bodies. The 6 foot rule of thumb is a good rule to follow. It gives the Tang a large enough of an environment to swim back and forth without too much obstruction. Hope that helps!