fish dieing...

Question
Hi matey, I have a small problem (apart from my spelling, sorry). I got home from work today and found all my fish sitting at the top of the water head up, apart from two neon teatas which were dead with very very sollowing tummies. I had done a water change the day before with treated water and so did another 25% one tonight. but now one of my clown louchs is very very pale and sitting on the bottom, none of the fish are eatting or show interest in food. the only thing i found when i got home was that the air pump and stones weren't going... i have now turned them on. this is switched on when the lights go out, and the tank has been running for about 5 months now. with a fulvel 404 and eheim 2028 filters and 3 300 watt hreaters at about 26 c...
the tank is 5foot by 2 by 2. planted with 5 clown, 4 neons 4 bristle nose, 6 peppered cory's two molly's, 4 sae. the last clown was added two weeks ago and he looks fine... help please..
now the air is on when the lights arent they aren't at the top...

Answer
Hi, funny you tel me this story.........because the same thing happens to me and i lost some rare beautifull fish because my filter and air pumps were "UNPLUGED"! AND since the air stone distribute oxygen to all your fish, your fish all need exygen to survive, So the first thig you need to do is a 70% water change, and make sure at the end you take a clean bottle which has no soap or any other substance and fill it up with warm water, then SHAKE IIT TILL YOU SEE LOTS OF OXYGEN BUBBLES IN IT THEN IMMIDIATELY DUMP IT INTO YOUR TANK, REAMEMBER TO DO THIS 2-3 TIMES AND MAKE SUR YOU HAVE YOUR AIR PUMPS ON AT ALL TIMES AND YOUR FILTER WOKING.Good luck and please let me know how you are doing.THANKS!