spoilers

this is the total number of war assets from the Salarians:

    125 from saving the Salarian councilor in me1 
    35  for letting Kirahee die and talking to Lt. Tolen at the STG base in me3 
    25  from Mordin if you persuade him that curing the genophage is a bad 
          idea with Wreav in charge and Eve dead 
    150 from sabotaging the cure and 
    8   from a Salarian side mission
    = 343

You also get the Krogan too with this  

    25  from Wreav 
    25  from Grunt if he survived me2 and his loyalty mission was completed 
    50  from Arlak company 
    50  from n7 Cerberus attack 
    345 from Krogan clans and also speaking with Diana Allers 
    40  from Krogan side mission 
    300 Clan Urdnot 
    =795

Add them together and you get a total war asset amount of 1138.

When you cure the genophage and lose the extra Salarian support, you get 875+169 which equals to 1044.

So kill Wrex and destroy Maelon's data. All it will do is change dialog, nothing bad.