DLC Pack 4 includes:

2x Moorfish:

Blue Telescope Eye Fish
Black Telescope Eye Fish

4x Butterfly:

Sunburst Butterflyfish
Bluelashed Butterflyfish
Copperband Butterflyfish
Forcipiger

20x Tangfish:

Blue Tangfish
Xuong Tangfish
Fowleri Tangfish
Dussumier's Surgeonfish
Orange - Band Surgeonfish
Xuong Lavender Tangfish
Xuong Kole Yelloweye Tangfish
Powder Blue Tangfish
Sailfin Tangfish
Pacific Tangfish
Mustard Guttatus Tang
White Tangfish
Surgeon Tangfish
Sohal Surgeonfish
Convict Tangfish
Lipstick Tangfish
Gem Tangfish
Yellow Tangfish
Purple Tangfish
Chevron Tangfish

4x Mandarinfish:

Orange Mandarin Fish
Blue Mandarin Fish
Lim Mandarin Fish
Brown Mandarin Fish

Improved fish food that makes them grow 2 times faster
Unlocked Screensaver
Water effect on screen unlocked