Reading SD Card and displaying via Chainable RGB + DMX

// MODIFIED Glediator Arduino UNO sketch by Jens Andrée
// 500k bauds with 80 pixels no problem
// sdcard stream for stand-alone operation.

#include <DmxSimple.h>
#include <FastLED.h>
#include <SPI.h>
#include <SD.h>

#define NUM_LEDS 5
#define DATA_PIN 7
#define CLOCK_PIN 8
#define CMD_NEW_DATA 1
#define BAUD_RATE 500000  //if using Glediator via serial

File fxdata;
CRGB leds[NUM_LEDS];
CRGB currentColor;

int brightness = 0;

void setup()
{
  DmxSimple.usePin(5);
  DmxSimple.maxChannel(21);

//  FastLED.addLeds<WS2801, DATA_PIN, CLOCK_PIN, RGB>(leds, NUM_LEDS); //se doc for different LED strips
   FastLED.addLeds<P9813, DATA_PIN, CLOCK_PIN, RGB>(leds, NUM_LEDS);
//  Serial.begin(BAUD_RATE); // when using Glediator via usb
  Serial.begin(115200);

  for(int y = 0 ; y < NUM_LEDS ; y++)
  {
    leds[y] = CRGB::Black; // set all leds to black during setup
  }
  FastLED.show();

  pinMode(10, OUTPUT); // CS/SS pin as output for SD library to work.
  digitalWrite(10, HIGH); // workaround for sdcard failed error...

  if (!SD.begin(4))
  {
    Serial.println("sdcard initialization failed!");
    return;
  }
  Serial.println("sdcard initialization done.");

  // test file open
  fxdata = SD.open("TCL_DMX.dat");  // read only
  if (fxdata)
  {
    Serial.println("file open ok");
    fxdata.close();
  }
}

void loop()
{
  fxdata = SD.open("TCL_DMX.dat");  // read only
  if (fxdata)
    {
      Serial.println("file open ok");
    }

  while (fxdata.available())
  {
//    fxdata.readBytes((char*)leds, NUM_LEDS*3);
    currentColor = fxdata.readBytes((char*)leds, NUM_LEDS*3); //attempt to store SD card read data as RGB
//    currentColor = (fxdata.read());

    Serial.println(fxdata);

    sendDMX(1, currentColor); //RGB Strip #, RGB byte from SD .dat file
    FastLED.show();
    delay(500);
  }
  // close the file in order to prevent hanging IO or similar throughout time
  fxdata.close();
}

void sendDMX(int theStrip, CRGB & theColor) {
  for(int z=0; z<3; z++) {
    DmxSimple.write((theStrip + z), theColor[z]); //DMX Channel, PWM Value
  }
}