Sick fish

[jenema]

So I just turned on my lights and noticed that I have a missing harlequin rasbora and a few that have what looks to be a fungus. Their fins are clamped but other than that they are acting normal. I took the best picture I could get of these fast little guys. Does anyone know exactly what this is and the best way to treat it? Also where it could have come from so I can avoid this happening again.

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[Brookster123]

What's up with the tank? Age, parameters, all.the details please. Could be the background but the water looks murky??

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[jenema]

The tank is 2 months old, it was cycled with old media. Ammonia and nitrite are 0, nitrate 10. I have been slowly stocking with plants and fish the last few weeks but they have been quarantined first. It currently has an angelfish, 7 harlequin rasbora (had 8 ), a basis badis, a Bolivian ram, and three ghost shrimp. I have plain white paper as a background right now and a diatom outbreak so that along with a blurry picture might be why it looks murky.

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[Andy Sager]

Harliquins are notorious for getting Velvet. You need to rule that out. If the area has a yellow tint to it, it's velvet. If it looks like it has a light dusting of white/yellow, it's velvet. Best treatment is copper and no lights on the aquarium as the parasite uses photosynthesis to survive.
Here is a link to a site that should help you identify the problem. Chart on Fish Diseases, Symptoms and their Treatments

Hope this helps