Set one element in Array to nullptr

new to C++ for a school project and I cannot seem to get past this final part of my project.

I have a class "Roster" that has an array of object pointers

Student* classRoster[MAX_ROSTER] = {};

These "Student" objects have been dynamically added to the array with a Roster method that does:

classRoster[arrayLength++] = new Student(...);

Where

#define MAX_STUDENTS 5
     int arrayLength = 0;

The goal is to remove a specific student from the array but keep the others. The function looks something like this:

for (int i = 0; i < MAX_STUDENTS; i++) {
        if (classRoster[i]->getID() == studentID) {}
}

Now inside this function I have tried a number of different things, delete the memory and set the pointer to null, attempt to delete the memory and re-arrange the array, but nothing seems to work.

I found this question with an accepted answer: Set array of object to null in C++, but that isn't working for me and I cannot figure out why.

I have set a bool and position int in the function before the loop and tried removing the student after identification, removing in the loop etc.

I assumed this would be correct:

delete[] classRoster[i];
classRoster[i] = nullptr;

(Where i is the matched student) But this deletes the memory for all the elements in the array and if I just try

classRoster[i] = nullptr;

that makes all the elements after "i" also nullptr.

delete* classRoster[i];

gives an error that we cannot delete type 'Student'

and

delete classRoster[i];

does nothing since the array doesn't have objects but pointers to objects.

What am I doing wrong?