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Yep, Ill take it. The sci name would've helped, since there seem to be multiple rainbows people refer to as the black lined rainbow fish. This one was Melanotaenia maccullochi, which your source and Wikipedia refer to as the black lined. There is also Melanotaenia nigrans, which is usually called the black banded, but sometimes called black lined Brainy courage of the rainbowfish
So keegster, Ill let you have it