I absolutely LOVE this aquarium light BUT it would be misleading to say that it fits aquariums up to 78 inches. My aquarium is 72 cm long. The light is 57 inches long when connected together. The extensions that support it outside the tank aren't long enough to keep the light stable. However, it doesn't bother me as I'm just centering the light and resting. it is on the top of the tank. Good bright light (noon) and changing light depending on time of day shine. As a small assembly suggestion, I have filed down the edges of the spar, the square edges get stuck when you insert them, which makes the work a lot easier. This is the best aquarium light I have ever bought. Thanks very much!
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