GloFish Color-Changing Background

GloFish Color-Changing Background helps add a finishing touch to your GloFish aquarium. The color changes under GloFish Cycles Lights. Each different Cycle Light Mode fluoresces and brings out vivid colors and hidden images. For aquariums up to 25 gallons. GloFish Color-Changing Background helps add a finishing touch to your GloFish aquarium. Hidden images appear under GloFish black LEDS, and fluorescent colors pop under GloFish blue LEDs. Buy one for aquariums up to 25 gallons, or two for aquariums up to 55 gallons. The background measures 18" x 24".