Hello 2 weeks ago I brought this male fish it was red after just 2 days it turned pale he hasn't eaten anything till now I offered him pellets,frozen dried worms,live blood worms and nothing he didn't even look at it...the way he acts is that he keeps surfacing all day building a bubble nest and sometimes he stands with his body as "S" shaped been adding anti-fungus medications and salt to the aquarium i do a full water change once weekly he lives in a 4 gallon tank with gravel and artificial plant no filtration nor a heater since room temperature is 82 F always..the most worrying is him not eating for 2 weeks now kinda freaky !! and here is a pic of him now

Any Ideas ??!

Any Ideas ??!