I have a couple of suggestions you migh try. Rather than just watering your coleus on a schedule, it might help for you to test the dampness of the soil in which they are planted. Coleus don't like to be soggy but they don't want to be too dry either. Care must be taken not to overwater indoor Coleus, nor should they be allowed to get so dry that the plants wilt. Another suggestion that might help: Coleus like a higher level of humidity than most houses have so they benefit from daily misting early in the day. One more suggestion: If you have had your coleus in the same pot for an extended period, it may be getting rootbound. You might try unpotting the plant, loosening the roots, and repotting it in a little larger pot. Hope this helps!