My whisper filter just died so I got a
powerhead in its place to help aerate the water and maybe also help out with some blue-green algae (cyanobacteria) that seems to be plaguing my plants.
However in my tank I have 3 guppies and 7 tetras and I'm worried that they look like they're having a harder time in the current, will they get used to it? I got a Penguin 1140 but I didn't realize how strong it would be (300 gallons per hour). I have a 20 gallon long tank, should I get a smaller powerhead?
Or would it be better to leave it on during the day and then turn it off at night?
Any help would be greatly appreciated.