Rummy nose fading and not shoaling at night? normal?

[gregalon]

Good morning.

Yesterday I purchased 5 rummy noses and within the hour they were happy and red and feeding on my flakes. This morning I wake up and I see that their noses and tails have faded a lot and they weren't shoaling as nicely. When I turned the lights on, within 15 minutes they were red and feeding. Is this normal??
thanks

 

[Tom]

Yeah that's normal

 

[mlgt]

THey tend to go to sleep mode. Its perfectly normal. Cardinals are the same they go nearly opaque and within 10-15 mins the blue colours come back up again.