09-16-2013, 08:50 AM #1
Harlequin Rasbora color fading when dark
I bought four Rasbora from my LFS about 3 weeks ago. Two of them died, one of natural causes and the other was my fault. The two Rasbora that are in there now seem happy and completely healthy. They are eating fine. I changed my substrate from gravel to sand yesterday, and last night is when I noticed their color fading. It only happens after I turn the aquarium light out. As soon as the light is back on, their color comes back. I'm not sure if they did this before the substrate change or not, but I just noticed last night. I added some Stress Guard to help them out, but still they fade.
09-16-2013, 09:01 AM #2
Mine do the same. When the lights come on they seem almost sickly pale but that's gone in 10 minutes.
You might want to consider getting more. These guys do establish a rudimentary pecking order. Ideal would be a group of at least 6 and of mixed sexes (ladies are chubbier and slightly less bright coloured)
09-16-2013, 01:48 PM #3
That is part of sleeping. Every single one of my fish does it.
09-16-2013, 03:36 PM #4
Thanks, and I'm going to be getting about 8-18 more.
09-16-2013, 07:11 PM #5Banned Discus fish
- Join Date
- Nov 2008
- Vancouver, BC, Canada
Most fish pale in darkness. Some alter their markings quite dramatically. This response is due to light receptors not only in the eyes but in every cell. All connected to the circadian rhythmn too. One reason to maintain a regular day/night schedule.
Fish will also do this due to stress of course, quite a different thing.