SLM-8000 [Mini – All-in-One] is suitable for aquariums 0.5–0.8 meters in length; SLM-13000 [Mini – All-in-One] is suitable for aquariums 0.8–1.5 meters in length; M8 [Mini – All-in-One] is suitable for aquariums 0.4–0.6 meters in length; W+-10 [High-Power – All-in-One] is suitable for aquariums 0.4–0.6 meters in length; W+-25 [High-Power – All-in-One] is suitable for aquariums 0.5–0.8 meters in length; W+-40 [High-Power – All-in-One] is suitable for aquariums 0.8–1.5 meters in length; W+-50 [High-Power – All-in-One] is suitable for aquariums 1.2–2.0 meters in length.