Mumma.of.two
Aquarium Advice Obsessed
scottb said:UPDATE: after testing my tank water, as well as my tap, I have decided I am good for fish. I was leaning towards Longfin Zebra Danios, but settled on 5 Harlequin Rasboras instead (hope this isn't too many). One thing I noticed is that 2 of them seem to have a lighter shade of the "triangle" towards their back fin. I wonder if this is just due to stress or of its an illness. Anyone have any similar experiences here?
Fish dull out/loose color when scared, stressed or sick. The coloring should come back when they feel more comfortable. Leave the lights off for the rest of the day. Also there are three types of fish commonly sold under the label of harlequin rasboras each just slightly different to another. That is also a possibility. If you are worried you can post a picture in the unhealthy fish section.