Help.........oily Surface In Fish Tank

[tmjkb]

I have a guppy tank that is about 40 gallons and I keep getting an oil like substance on the surface. I have had the water tested but it keeps coming back even if I change all the water.
Could this be from my pump or my heater?
All my guppies are dying..............please help

 

[kat11180]

I have a guppy tank that is about 40 gallons and I keep getting an oil like substance on the surface. I have had the water tested but it keeps coming back even if I change all the water.
Could this be from my pump or my heater?
All my guppies are dying..............please help

this might sound silly to do but iv done this on advice from a friend and it worked... turn all pumps filters etc off let the water settle down for a few mins then gently put a good strong none colouerd kitchen role paper on the top of the water you do this gently enough it wont sink then take it off and bin it do it a few times till it looks clear then turn everything back on and this will get rid of the stuff on the water but the problem that courses this i dont know am sure someone else could advice you on that .

 

[zoekin8yg]

try increasing the agitation of the water surface, and make sure the tank has a lid and isnt too close to the kitchen

 

[Spooky76]

It could be from food, of your hands even ?
What food do you use ? With the Tetra Pro I get some oily residue on the surface sometimes. Also if you put your hand in often you leave some grease on the surface.