JBJ 28G Intermediate NanoCube Replacement Daylight LED Remote Ballast (for MT-603) The JBJ 28 Gallon Intermediate Nano Cube Aquarium with LED Lighting (MT-603) Replacement Daylight LED Remote Ballast is Part #18 on the exploded view diagram in the JBJ 28 Gallon Intermediate Nano Cube Advanced Aquarium Manual.