Im not sure if my rainbowfish like the powerhead. They stay in one spot in the current but they are in the back corner of the tank. I have the powerhead pointed so it will blow against the bow front of my tank. Any suggestions?
maybe it is to strong for them? do you turn it off at night so they have time to rest? rainbowfish do like to swim in current and they look really nice when they do, but im thinking it is either to strong or they are getting tired and need a break.
If you can not turn it down sufficiently, you can also tie a piece of filter foam over the outflow. I had to do this reduce the flow of some of the powerheads I have because they were blowing sand everywhere.