yes. on at 8:30 and off at 8:45. last water chang was 1.5 weeks ago. ive been doing them often but it doesnt help. its clear 4 a day then it green then next. 30 gl show- 2 peackock african cichlids, 1 scophi, 3 unidentified litlle white africans, 1 sae, 1 pleco, and 1 otis sinctus.