discus lack of oxygen

Question
Hi I am new to keeping discus all has been fine for 2 weeks but got up this morning to find my spray bar had fallen off all my fish gasping at top off tank rectified the problem did a partial water change but 2 of the fish are still at the top of the tank looking stressed any advice please do you think they will survive
thankyou

Answer
Hi Nigel,
How big is your tank?  Would you write back to me please, and give me more details.  What is your PH, and have you checked for ammonia and nitrates.  Discus fish are a little harder to keep than other fish, they need special attention.
Lynda