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Hipargero 30W LED Aquarium Coral Reef Lighting is one of the best lighting options if you are building a nano reef aquarium or similar under 40-gallon reef aquarium. It is affordable but also very powerful and competent lighting system that can be used in most mixed reef setups. It is a small light that produces a small light spread. This lighting system features touch-sensitive controls and an adjustable 2 channel light system. However, this touch system can get a bit finicky at times. Moreover, it also includes a mount for easy installation but this mount is too long for some nano aquariums and does not adjust. What the users like about this light system is that the manufacturer completely backs its lights with a 30-day money-back guarantee and happily answers your question 24/7. Overall, this unit is preferred for small reef tanks.
MICMOL Smart LED Aquarium Light

MICMOL Smart LED Aquarium Light is specifically designed for growing saltwater coral. It allows you to instantly choose the perfect lighting for your aquarium that mimicks sunrise, sunset and even lightning storms by using a smart controller. Moreover, it can be set to an automatic cycle that moves gradually between 6 stages or can be manually programmed to your coral’s need as it grows. It features a thin unibody design that can be mounted on tanks ranging in 13-66 inches in length. Users prefer it for its affordability, easy assembly and plenty of opportunities to customize it. It can be adjusted to each spectrum of light i.e. red, blue, and white. Due to its sleeker frame, it should not be mistaken to sacrifice power. This lighting system provides all the brightness you would want from a high-tech lighting fixture.