white cloud mountain minnow

I was out looking for a few more Gold WCMM to add to my 18G and came across 2 that had yellow fins. Pretty unique, I just had to take them home. Does anybody know if this is common? If not, I was hoping I could make a breeding project out of this.

I currently have a 70 litre (18.5 US Gallon) tank with dimensions of 58 x 30 x 40cm (23" x 11" x 15"). The temperature is kept unheated at around 18 Degrees Celsius (65 Degrees Fahrenheit) with a stocking of 6 Golden White Clouds and 3 Platy (2 female:1 male). According to AqAdvisor, the...

My fish (minnows) just stare at the background all day. Only move around during feeding time. Mostly they just stay in the back staring. Any suggestions or reason for this?

I am setting up a new tank and was wondering if the White Cloud minnows would be okay. It will be a tropical tank, at about 76-78 degrees. Is that too warm for them? I know that typically they are a cool water fish. I also have water that is fairly high pH (about 7.8).   Beyond the question of...

Can anyone give me any indication of what is wrong with this fish (WCMM)?  It originally started looking like it had swallowed a "figure 8", but with the 8 sideways on.  Now it looks even larger but not sure what it is?  She eats fine and seems well other than getting larger with whatever is...