Today i did a water change in my red tails grow out tank. and i noticed on one side it seems like he has or is getting gill curl. what i got from yahoo answers was that its from poor water conditions / lack of air. my set up is a 40 gal tank. with a heater. and a penguin 200 bio wheel. 1 air strip and 1 air stone. After i did a water change i went out and bought a aquaclear 50 filter to add on. i also added a little aquarium salt (1 tsp = 5 gallons i put 2 wasnt sure to put the amount for 40 gals). what else should i try doing and how long does it usually take for it to go away if it does. thanks. when my friend gets home later ill try posting up the results of the water after everything settles down.
