DaveK have you read any posts regarding decreasing the photoperiod in tanks running bare bottom. I was reading posts regarding sps tanks and photoperiod and some reefers that run bare bottom and maintain very low nutrients only run their halide lamps about 5-6 hours maybe less and if they run them any longer would have bleaching. Sounds interesting as big hydro bills suck and you would have less temperature issues as well. I know that the nitrates for example have an inhibitory affect on calcification but can be overcome by keeping an elevated KH. How would nutrients and lighting tie together?
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