I was just planning on breeding daphnia but i’ve finally about had it with the unchecked breeding in my tanks. I rounded up my male swords and they have a new home in here. I put them in mid day (i believe 7 adults) and they almost all seem to be using their mouths to push more water through their gills which suggests low oxygen. Also i didnt notice much pearling today after adding them. This tank was outside and i moved it in last week so its still adjusting a bit too. Tank size is 40b. Im afraid to leave them overnight so i setup a fan atleast for the night. dont have much room for a filter but i could pick up a powerhead tomorrow if need be. lights on 12 off 12.