Originally Posted by CleverBs
well that doesnt make sense to me beings if you walk up to a 6ft tank they will dart straight back into the glass 24" away. I dont get the idea that they need a 6ft long tank. Nothing i seem to come up with supports this idea. I really think its just a volume issue. Because tangs would be perfectly fine in a 240g cube and its 4ft by 4ft
well they would run directly away if they are skittish. And if the back wall is only 24" away thats where they will end up. The point I was making is they almost always dart away from me in a straight line when I'm diving and chasing them. Most other reef fish will zig and zag if I chase them.
As for the 6 ft requirements, that is what most professionals will recommend and what the 125gal requirement is based on.
But there are many out there that will tell you they are fine in a 20 gal
tank too. But I would rely on the credible advice from professional sources.
My opinion is only meant as an observation I have made diving on reefs as to the reaction of tangs in the wild.