Help! How do i treat this betta

[SpeakNow13]

I saw this Betta at a large retail establishment in a tank with some glowlight tetras and he is GORGEOUS Except for this white stuff??? What is it and ANY IDEA HOW I TREAT IT! I have AQ salt, some maracyn, some lifeguard by tetra that is supposed to treat everything, I have plenty of stress coat, I have a 5 gallon QT with heater and filter. Its like a white patch right on his gill on the left side. Ill try to get some more pics. Please. any help needed.

[SpeakNow13]

Please help me? It looks like mold or puss in his gill

[callistra]

Your photo is hard to tell anything but based on description..

I'd do two water changes a week - one 50% and one 100% including a thorough rinsing of gravel. Make sure the filter isn't too strong for him and put a prefilter on any intake tube of an HOB.

I'd treat with Seachem Kanaplex if you can find it and Maracyn Plus (not to be confused with Maracyn or Maracyn II) or Furan 2.

[SpeakNow13]

Thank you, Heres a kind of better pic?