Place tilapia in a large plastic bag. Pour ½ of the bottle of Stubb's Green Chile Marinade over the tilapia and seal bag. Marinate in the refrigerator for 4-8 hours.
Preheat oven to 400° degrees.
Remove tilapia fillets from bag and shake off excess marinade. Preheat a skillet to medium heat. Spray skillet with canola oil. Add tilapia and cook for 3 minutes per side or until cooked through. Remove from heat. Cool slightly and break into bite-sized pieces.
Spread tortilla chips on sheet pan. Evenly divide tilapia over chips. Follow with cheese and black beans. Bake for 7-10 minutes or until cheese is completely melted.
While nachos are baking, mix together sour cream and ¼ cup Stubb's Green Chile Marinade. Set aside.
Remove baked nachos from oven and add additional toppings like radishes, tomatoes, salsa, avocado, cilantro, green chile sour cream, etc. Serve immediately.