I've been trying to track down a leak in my pond so I've been turning off and on the waterfalls, doing the usual testing. I turned off the koi toilet with the bubbles and my fish the next day were all hiding under rocks. turned off the waterfalls and only had the bubbler giving them air and later that same day they were frisky once again. I repeated the test over the next few days and got the same results. Could this be because the water is more disturbed so they feel to move around more freely or is this just a coincidence?