if anythign it sill slow the cycle..
most hitchickers that come on the LR, will make it througha normal cycle.
just test your ammonia, it it starts getting high, and doesnt come down, then just do a water change..
thsoe feather dusters will be fine.. once you get the tank established you will see them ALL OVER the place.. as for the "coral" it really depends, anything that came on the rock may or may not live depending on what it is. (a pic may help ID it)
you know, my opinion is to let it happen naturally, control it with water changes if needed. those additiona chemicals are not usually needed.
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