PTF (Pasadena Tropical Fish) also sell their fishes in the bag straight from the wholesaler. I remember went there couple years ago and saw people were gathering around to buy their fishes arrival in the bags. Ha Ha
You can contact AI and ask for Replacement Lense. FREE of charge and Free Shipping. AI16 lenses has issues with burning. AI will take care of you.
Here is the email: support@aquaillumination.com
It suppose to come with Aquaticlife T5 fixtures.
For replacement parts, you can order from here:
T5 HO Hybrid 4-Lamp Mounting System Fixture Mounting Bracket, 16-Inch – aquaticlife.com
It's universal mount. You can put Any type of lights in there.