Not at all... You are absolutely right, but it's not the temp. which is 80.2 Fahrenheit. After installing the rock background and doing a partial water change they started breathing that way. Thought it was just the water change, and that maybe the rock background had some debris affecting the water. They looked ok when I woke up in the morning, but when I arrived home from work, half of my fish were gasping for air and when I checked my levels, my nitrites were through the roof. Needless to say, I lost my Exodon and Albino Red Tail Shark. I did however do another 20% water change and added dechlorinator and nitrite reducer, but that still wasn't helping. I added a cup of Aquarium salt ( my tank is 100g) and plugged in two air pumps and ran the tubing to the mouth of my twin 3200GPH wavemakers and hoped to oxygenate my tank. Well, it is working. It looks like it is snowing inside my tank but my fish are no longer gasping. They are chasing each other as usual...but I still don't know why my cycle crashed like that. I've only had this happen once about 3 years ago, but boy is it scary. I was about to move my fish temporarily into my 15g fry tank and say to hell with the fry. But, i remember having oxygenated the tank last time and it helping, so I figured I would throw a hail mary. So far they are doing ok, but I still have no idea what the heck happened. Thanks for BIG-G and JimA pointing it out to...! It is good to know there are good people out there looking out. Thank you! I will try and put up another video of what they look like now, any feedback would be much appreciated....