Just added a cooling fan to my main 160 gallon display tank. I just need some experts’ opinion on some things. Pls help if you can, Thanks in advance 1) When the light is off, should I turn off the fan too? 2)The fan is set to maximum and creates a current along the length of the tank. Most of my mid dwellers( various tetras, ricefish and rasboras) seem to be swim back and forth on the current. But fishes like my small hocky stick shoal and lone fire panda guppy are now staying firmly on the opposite side of the tank or having trouble swimming where the current is. Should I be worried? 3)Totally unrelated but some of my corries are now bashing the water surface. When the come up for air, they make big splashes. Is something wrong?