I have had frags recover after they started receeding. I have also had some slowly recede and then one night just totally RTN. Its just a matter of waiting them out after you've gotten your water parameters back in order. However during that time they can also continue to recede, it just depends on whether they're happy with the new conditions. I dunno, I'd probably try fragging them, or just take one frag off and put it in a different spot.
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