Fant denne opplysningen i en artikkel om hvilke behov guppy-yngel har. Der står det at guppyer som lever i dunkel belysning ofte utvikler ryggproblemer. Ville bare nevne det, ettersom det kanskje ikke er så kjent.
Det står følgende:
Lighting is also an important aspect in the growth of guppies. Many breeders keep the lights on anywhere between 12-17 hours. Strong bright lights are not necessary, but guppies that live in a dim tank will often form deformities of the spine. Lights should not be kept on around the clock so that the fish can rest and relax for at least 7 or 8 hours.
Her er hele artikkelen: