This is a funny thread. Good idea, krib.
Even the first post, full of sciencey-type stuff!
Tiger Barbs's colors sometimes iridesce different colors. As you have pointed out, the black sometimes appears greenish. The green color morph, since more scales are that black color, iridesce more green. I have noticed that my barbs will change colors depending on how soon after I have turned the aquarium lights on.
A better, more complete decription of this effect, called the Tyndall effect after the physicist who first documented it, can be found here: The Skeptical Aquarist's Page on Barbs it is a ways down the screen... do a search for "Tyndall" to jump right to the description of the Tyndall effect
Even the first post, full of sciencey-type stuff!

, recently perchased my first small(ish) aquarium, its a 80L and is currently cycling before I add any fish
)...Which could you recommend that 1)Wont out grow my tank 2)Cause problems in a community set up...Any help much appreciated!







