curious myself, I was gone for 4 days, left the lights off, dont have a timer yet for em, and when i got back all the guppies were alot lighter in color, left the lights on for a day and bam bright again. opposite of yours but thought it was interesting.
, Cascade 700-- busted during move...
- quarantine tank
- Filstar XP2- 2 gold rams/3 juli's, 3 paleatus/ 2 oto's/ 6 fancy guppies/ 5 ghost shrimp, mts
.fish--6 Neon Gourami-2 Sunshine Gourami-10 Longfin Rosy Barbs-1 Chinese butterfly fish-1 kooli loach-1 red tail shark
10gal hosp, 29 gal island tank, 50 gal tree trunk tank.