Just wondering if anybody out there knows - Sun Coral's dead head(s) can regenerate after getting excellent conditions, water parameters, lighting, food etc., (taking into account that there are some left alive)???

idk..but i do know that sun corals should not be placed in water without good water conditions.and also sun corals dont depend on light. you need to feed themevery other day each head .and they should do good..good luck
swp