White slime on gold barb

[Aces11]

Today I noticed what appears to be a white slime/coating on one of my gold barbs. The fish is still very active and eats well and I haven't noticed any fish flashing. What might it be? Its not fluffy or raised.
The tank has been established for years. I have 4 gold barbs, 2 platys (added last weekend), and I added a betta today but he might be put in his own tank when I go back to college.

 

[Matt68005]

I have had that on my fish before. I think its called body slime or something. I believe the correct med is Furan2
I think its just from a bacterial bloom in the tank that then grows on the fish's slime, like Good bacteria tho. Google body slime disease fish.

 

[Brookster123]

It's the slime coat slogging off. How often you change water?

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[Aces11]

No its not slogging off. It doesn't even seem to raised off the body at all and he still bwhaves normally. I change the water every 2-3 weeks, sometimes I go a little longer since there is a small bioload.

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[Matt68005]

Need to change it once a week at least. They have furan 2 at walmart cheap.