Can I resolve the krogan / salarian conflict with both sides supporting the Alliance?

Yes you can

You need Wrex alive for this and need to have saved the council, inform wrex of the Salarian Councillors duplicity and Mordin will say he can bypass the safety protocol to administer the cure. When you eventually save the Salarian councillour at the Citadel the Salarians will give you their full support in thanks (Hackett will tell you this in vidcom) unfortunately you still lose Thane :-( but its the way he would of wanted to go!! RIP Thane

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.

I was able to get both their support with Wrex alive by not telling the Krogen about the sabotage then choosing to shoot Mordin before he could fix it. It means you betrayed Wrex's trust but hey, he's still alive and you get both Krogen and Salarian support.