I Have had my 240 gallon up and going for 4/5 months now . had an oscar that I"ve had for atleast six year's now and two new aquired fish.One was a 9inch Pleco & about the same size TSN, which ive had for about 2 months now and the Pleco was the most recent at 3 weeks . Well everything was perfectly fine in the mournig when i feed them. Then I recived a call from the girl friend that the fish were going crazy jumping out of the tank When I finnaly arived all were dead exept the oscar but died alittle later any way. I had feed them some feeders that mournig and the day before but everything seemed fine and the rest are still alive But the next mourning the tank was really cloudy And smelled bad like something, not dead fish or anything but to me it smelled like chemicals or almost like the vynil hose was melting or something. My girlfreing say it smelled like glue to her. I have no clue what happen and all the fish died within a few hours. If it were the feeders would it have made the water cloudy and smell like that? I didn't find anything melted or obviosly wrong & nothing was added to the tank and I know nobody tampered with it. Has this happened to anyone? I'm totaly confused & detered becasue i dont know what happened .... CAN ANYONE HELP??????????