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I used the mod kit on an MJ400 in my 10g. I did not like the standard MJ because it shot a narrow fast jet of water. The mod kit does the opposite. It pushes a broad wall of water, much more like an ocean current. This created a new problem for me. The MJ400 without the mod was ineffective; whereas the MJ400 with the mod kit was way too much. In my 10g BB, it was moving LR around the bottom of the tank. the solution was very simple. Using the dremmel tool, I shaved the prop by half. I face the flow across the tank into the skimmer return flow. Now the conflicting currents more resemble the surge action on a reef then the jet stream of the straight MJ.
I am happy with the results of the modified mod kit. I could not justify a vortech on a 10g.
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