Help adding ability to unit group

I am trying to add an ability to all units of player matching condition, but I can't figure out how to do it. Am I doing the action part right?

NE bonus Gui
Events
Unit - A unit comes within 126.00 of Alchemist 0126 <gen>
Unit - A unit comes within 126.00 of Demon Hunter 0080 <gen>
Unit - A unit comes within 126.00 of Priestess of the Moon 0079 <gen>
Unit - A unit comes within 126.00 of Keeper of the Grove 0078 <gen>
Unit - A unit comes within 126.00 of Warden 0624 <gen>
Unit - A unit comes within 126.00 of Naga Sea Witch 0625 <gen>

Conditions
And - All (Conditions) are true
Conditions
totalHeros[playerIndex] Equal to 5
pureRacialBonus[playerIndex] Equal to 3

Actions
Unit Group - Pick every unit in (Units owned by (Triggering player)) and do (Unit - Add Damage Bonus (+15) to (Picked unit))

Ok, so I ended up finding my problem.

I replaced this
Unit Group - Pick every unit in (Units owned by (Triggering player)) and do (Unit - Add Damage Bonus (+15) to (Picked unit))


with this
Unit Group - Pick every unit in (Units owned by (Owner of (Triggering unit))) and do (Unit - Add Damage Bonus (+15) to (Picked unit))


Now is there anything else I will need to do with this to prevent lag? I thought I read something by Lord Vexorian about unit group triggers causing memory leaks and using DestroyForce. Would this work ok?
Unit Group - Remove all units from (Last created unit group)

to destroy the group itself im pretty sure you need to use custom script.

Seeing as how this trigger probably runs only a couple of times in the course of one game, and it leaks only a single unit group each time, I would say don't bother about it.