Absolutely 100 % NOT TRUE. All tanks need to be cycled, fresh and salt. It takes a while but it is worth the effort and no fish are harmed in the process...good for you for taking the initiative and reading/researching BEFORE hitting a problem.

We also have videos on the topic but if you have any trouble finding them just give a shout and wave a flipper..someone will swim you in the right direction.
Hey...and welcome to FTF, we are glad you are here and we are here to help however we can.
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200 Amazon
Discus, Angel, Rummy Nose
Nano
2 Percula Clowns, 1 Chromis