Unable to delete member pointer to array in destructor for class

So I am trying to delete my member pointer m_memory as it points to an array of char. When I try to delete the array that m_memory points to using delete[] I end up triggering breakpoints. I tried initializing m_memory as a nullptr before using new but it still triggered the breakpoint. Just wondering what my error is.

Header File:

#ifndef FISH_H
#define FISH_H
#include <iostream>
class Fish {
public:
    Fish(int capacity, std::string name);// Constructor
    Fish(const Fish &other); // Copy Constructor
    ~Fish(); // Destructor
    Fish &operator=(const Fish &other); // Assignment Operator
    void remember(char c); // Remember c
    void forget(); // Clears memory by filling in '.'
    void printMemory() const;// Prints memory
    std::string getName();
protected:
    const char* getMemory() const;// Returns memory
    int getAmount() const; // Returns amount remembered
    int getCapacity() const; // Returns memory capacity
private:
    std::string m_name;
    char * m_memory;
    int m_capacity;
    int m_remembered;
int m_replace;

};
#endif

Implementation file:

#include “fish.”

Fish::Fish(int capacity, std::string name) {// Constructor
    this->m_capacity = capacity;
    if (capacity > 0) {
        this->m_capacity = capacity;
    }
    else {
        this->m_capacity = 3;
    }

this->m_name = name;
this->m_memory = new char[this->m_capacity];
this->m_memory[this->m_capacity] = '\0';

for (int i = 0; i < this->m_capacity; i++) {
    this->m_memory[i] = '.';
    }
    this->m_remembered = 0;
    this->m_replace = 0;
}


Fish::~Fish() // Destructor
    {
        delete [] this->m_memory; //exception thrown, breakpoint triggered
    }

Main:

#include "fish.h"
int main() {
    Fish *nemo = new Fish(3, "nemo");
    nemo->~Fish();

}