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there is a chance that I will get a true Burundi petricolas but they come from natural environment - how long should I quarantine them?
Thanks.

I would say beween 2-6 months, The longer the better. You can still make your quarantine tank look somewhat natural. It doesn't have to be too "empty", leave out substrate but put enough hiding places in that the fish feel secure but you can still check on them without moving the decore.

Thanks :).