An Aqua One PL18 compact fluorescent tube half sunlight and half, softer, pinker tropical light. Our favourite combination which gives a very balanced light with excellent colour rendition and good penetration to the bottom of the aquarium for plant growth. This PL18 tropical and sunlight mixed tube is the one chosen by Aqua One to supply with new set ups. This is a great best of both worlds PL18 offering the punch of white Sunlight along with the gentle colour enhancing properties of Tropical. The combination of the two is pleasant to look at and always brings out the best in your fish and décor. These are the tubes supplied in any New AquaStyle 620 or AquaStyle 620T but will not fit your Aqua Nano set up. When changing any PL tube take your time and only ever grip the plastic base of the tube.They can become quite stiff to remove so take it slowly and gently wiggling the tube from side to side until it pops out. Make sure the new one is pushed firmly into place.