I got four new dwarf neon rainbows on Saturday. On Sunday I noticed one of the females had what appeared to be a small white pimple on the end of her nose (top of her mouth)? She was otherwise normal. On Monday, it appeared that the little white pimple was floating into and out of her mouth. Again, she's otherwise acting normal. This morning, I noticed a small white pimple on the chin (bottom of the mouth) on one of the males. Again, all are acting normal, eating fine I did some online research. Does this sound like columnaris? I am a newbie and a bit terrified by the prospect of having sick fish and treating the tank. Any advice?