I have a 2 newly planted from pot Lilly pilly sublime trees that are not doing well. One in particular is very dried out with dull leaves that are dry and falling and some burnt tips. I have watered in, applied seasol to roots and on top and general fertiliser when planting. It gets full sun a few hours a day and partial sun rest of day. I have another 5 plants planted at same time doing great so not sure about these two. Could nearby gum tree or teddy bear magnolia be sucking soil nutrients? Please advise I do not want to overwater and drown roots as I’ve read it is a hardy drought resistant plant.