Does it look like this? This is one of our fish who had (obviously) an odd white spot a couple of years ago. There's a thread around here somewhere. Anyway, we treated the tank with Erythromycin and it cleared up in a couple of days. We also had some flowerhorns that would occasionally get these type of spots and Erythromycin would clear it up. I never did figure out what it was, but I assume it's a bacteria since the antibiotic knocked it out pretty quick.
![](http://i180.photobucket.com/albums/x315/imagirlgeek/Fish%20Pics/DSC_0455.jpg)
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