This is a great wave generator! I bought 2 units for my 55 gallon fresh water tank after reading numerous reviews that said 2 units was the way to go. However, I think a single block for water circulation would work well (as seen in the video I posted). A block circulates very well in the upper, middle and lower range. I'm really impressed with the circulation with just 1 unit. I don't currently have any fish in my tank (while adding live plants and giving them time to root), so I'm a little concerned about small fish being sucked into the fan/blades of the unit due to the force of the unit. I plan to put a timer on the device so the fish can have a little "not to worry"! :) I'm also glad the device isn't very noisy (as noted in the video). The device is a bit larger than expected but if it helps keep my tank clean then I'm happy with the size and visibility. That! I'm not disappointed in buying 2 units (although I only use 1) because they weren't very expensive and worth having a backup. would buy again.
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