The Glowlites are about a year old. Other fish: 2 SAE's, 4 Rummynose, 9 Priscillas (total of 5 new ones bred in the tank), and 5 Harlequin Rasboras. Now down to 7 Glowlites as the sick one died. Tank is a 29 gal tall with the original HOB filter, from which I have removed the charcoal. Weekly I change out 1/3 of the water. I feed bloodworms twice a week, and two types of flakes otherwise, with no feeding on water change day. My routine hasn't changed for almost a year.