First, don't give it anything but water right now. You aren't feeding a sick person, and the seaweed won't help if the roots are rotting.
Does the tree give partial shade (dappled, with rays of sunshine coming through) or full shade, with no rays of sun? It needs some sun, and less water, and no food, and you can do a little voodoo dance, but from a distance.
If it's crispy now, it may be too late, because as mentioned before... junipers are sort of delayed-reaction trees. They're too far gone before it becomes noticeable, sometimes. But give it time.
Joanie