3 MP40s in TSM most of the time, with max speed limited to about 80%. A few hours before water change, I switch them to NTM. That only takes one push of the mode button, same thing to go back to TSM. An MP40 on each end glass & one at the back. One on the end is the master, the rest are slaves. The MP40 on the back glass is limited to a lower maximum speed because the tank is narrow. Tops of the pumps are about 3 & 1/2 inches from the water surface.
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