Every fish needs bacteria. Bacteria=cycled tank, meaning that you have 0 ammonia, 0 nitrItes, and some nitrAtes....usually more than 5ppm. Harlies are pretty hardy, but I don't think I'd use them to cycle a tank. If the tank is already cycled, then they should be fine as the first to go in.
I think you posted in the wrong section.......in the future please post threads like this in General FW.
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*Kristin*
5 Planted tanks:
55g, 40g, 29g, 20g, 5.5g
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