13 April. One current pump, Tunze Stream 3 quit working 3 days ago. I replaced it with a Tunze 6105 yesterday using the large divergent flow nozzle. Placed the power on low. This morning, a 1/4 of the sand was blow from right to left. Oops. I must raise the pump a bit. Then I found the rear bearing for the Stream 3 in the overflow box and it works just fine. Oops again, 220 dollars needlessly spent.
Now I have the Stream 3, two 6105s, and the return from the sump. I will try using the return and one 6105 for steady circular flow and the Stream 3 and a 6105 for a standing wave. Maybe the 220 spent will be useful. Standing waves really clean out the crevices and help keep detritus flowing to the filter instead of sinking into the sand. Plus, the bouncing movment of the corals is beauuuutiful.
Did a nitrite test with the Redsea Nitrite/Nitrate kit after seeing the sand as it is. Nitrite is detectable this morning around 0.5 PPM. I raised the temp by 1C for the nitrifying bacteria to 27 degrees. I have 300 liters of change water but only if continues to rise will I change.