Coral Viewer is fantastic! This adds depth to the experience for those with a reef tank. I have a 150 gallon SPS reef aquarium in my living room. 6,000 gallon per hour capacity pumps make it impossible to see what I'm doing when I'm working in the tank. The coral viewer breaks through the water surface and lets me see clearly without turning off the pumps or interfering with the system. The viewer floats on the surface of the water so I don't have to worry about it going under, and it's deep enough that I don't have to worry about splashing water hitting the viewer and obstructing my view. Another thing the viewer is good for is photographing. You can put your phone or camera in the viewport and take great pictures without glass distortion.
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