as you can see from my previous tank pictures,..starting t o have cyano algae growth on bottom left due to my feeding every other day......I added additional bulb and had those attached to egg crate lid...just washed my ATS ,alot of waste and only growth are these.......will monitor closely as I just added the 2700k; 23 watts ES bulb.....so top (daylight 6500k/ base is 2700k "warm white" if either show better results, I will change the bulb accordingly