my young oscar hasnt eaten proply in about 3 weeks, hes only about 2.5"/3". when i open the lid all of the other fish come to the right hand side of the tank ready to be fed, but the oscar swims away. he has the occational pellet or bloodworm if one is beside him, but he hasnt eated proply for about 3 weeks. he used to stuff his mouth as full as he could get it. is this loss of appetite ok?
hes a tiger oscar and he keeps going a strange white colour as well. the water is fine and the other fish are fine as well.

Firstly can you test your water for amonia, nitrite and nitrate

As for feeding try putting the food all over the tank and not one spot. Also try different food- I feed pellets, maggots, worms, defrosted frozen prawns and any insect i can find. There are other foods as well- check the section on the home page about oscar food

the nitrate level is at 5ppm at the moment, i dont have a nitrite or amonia test kit at the minute.

i feed pellets, bloodworms, prawns and any small insects i can find. he dosent seem intesrested in any of them.

You need to test for ammonia and nitrite.

Is the oscar being bullied?

ill need to buy some more of the test kits.

no hes not being bullied at all, hes in charge of the tank.

How long has your filter been running ,what's it's flowrate and what are the dimensions of the tank?
And we need those results Delboy asked for.
If you go and get some tests please buy the liquid bottles instead of teststrips.
The liquid ones are more accurate.

the filter has been running for 6 months now, its flowrate is 1250L/hr. the tank is 120mm x 66mm x 50mm.
yeah ill get the test kits today. ok thanks, my nitrate test kit is a liquid one as well.

oscars can go around three weeks without food so i would be worried if i was you there might be something wrong with him i dont know whats going on but he might be eating leftover stuff off the bottom you can tell when oscars eat cause there stomaches get nice and fat