Will need to fertilize now that the rich substrate is gone. C. Willisi suffering, C. crisp. balensae and all other plants fine. Probably using stored nutrients. One clump of hornwort pale. Adding K+, Cal/Mag, Fe. Will add traces and excel after a little observation. Am guessing I will need to add: 5~10ppm K+, 7 Fe, traces and standard dose excel. Could probably take the light up another 32 watts then to 2wpg.