PQR: Spam heal while debuff x

[itseme]

Hey dudes,

I'm pretty new at writing pqr scripts. Now I'm stuck..
I want to write a script that does the following thing:

"Cast Spell x while debuff is on raid member"

I tried several things and my closest was:

if UnitDebuff(PQR_CustomTarget, "InsertSpellNameHere") then return true end

But it just spams my healing spell if the named debuff is on me but pqr doesnt realize when its on raid members and nothing happens..

I use PQR_CustomTarget as variable for member count.
This is my targeting/member count script I'm using:

if UnitExists("target") 
  and UnitIsDead("target") == nil
  and UnitIsFriend("player", "target") 
  and UnitCanCooperate("player","target")
  and UnitHasVehicleUI("target") == false
  then PQR_CustomTarget = "target"
          PQR_CustomTargetHP = 100 * UnitHealth("target") / UnitHealthMax("target")
else 

PQR_CustomTarget = "player"
PQR_CustomTargetHP = 100 * UnitHealth("player") / UnitHealthMax("player")
local group = "party"
local members = GetNumPartyMembers()
lowhpmembers = 0

if GetNumRaidMembers() > 0 then
  group = "raid"
  members = GetNumRaidMembers()
end

for i = 1, members, 1 do
  local member = group..tostring(i)
  local memberhp = 100 * UnitHealth(member) / UnitHealthMax(member)
  if UnitInRange(member) 
  and UnitIsFriend("player", member)
  and UnitIsDeadOrGhost(member) == nil  then
    if UnitGroupRolesAssigned(member) == "TANK" then memberhp = memberhp - 1 end
    if UnitThreatSituation(member) == 3 then memberhp = memberhp - 3 end
    if UnitBuffID(member, 53563) ~= nil then memberhp = memberhp + 7 end
    if memberhp < 85 then lowhpmembers = lowhpmembers +1 end
    if memberhp < PQR_CustomTargetHP then
      PQR_CustomTarget = member
      PQR_CustomTargetHP = memberhp
    end
  end
end

end

[Numba1stunna1]

You need to be more specific. What is this debuff and how do you want to prioritize healing? Debuff > HP filter?