Mollie fish ill?

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Hi all,

one of the mollie in my tank (125 ltr) has been for the past couple of days only been staying in the corners of the tank. Its usually all white (like a silvery white colour) but during thse past couple of days its started to go black not completly black, just like the scales runnign along its back and the side of its gills are turning into a kind of dark grey. (if you ever have painted warhammer it looks like its been drybrushed silvery dark grey/black) and i was wondering if there is anything wrong with it.

It still eats normally, and ive seen the other mollie go enar it and chase it so im worndering if tis getting atatcked? im not sure wheat sex the two mollies r.

any help would be appricatited

 

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First of all tell us how long you have had your tank for?? Do you test your water for ammonia and nitrite???

The blackness sounds like ammonia burns but i maybe wrong.... Post us some more info asap

 

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ah, well the tank is fairly new but is cycled (as it was cycled b4 i bought) ammonia is 0ppm nitirite 0ppm and nitrate is normal amount. I have 2 clown loaches in their and a angel fish and they are shoing no signs of distress or anything and i beleave they are quite fragile fish.