Blue Platy Sick?

[whitehouselogan]

hey all,

looking for some help re: a blue platy. i wondered if it might be ill as it is behaving odd. it keeps just sitting on the bottom of the tank and not moving, but then it moves to eat and i have observed it and it seems to be eating ok. when i first got it, it swan around quite happy. any ideas?

 

[WILDER]

How many gallons or litres is the tank.
How many fish and which type.
Water stats in ammonia, nitrite, nitrate, and ph.

Does the platy lean to oneside when resting.
Does the platy look pale or darker in colour.
Does the platy look bloated or thin.
Is the platy acting listless and lethagic.
Hows the platys breathing.