As a general rule, I'd get your nitrates up a little. 2-5ppm is a good place to be. Older, mature tanks seem to run well on 0 nitrates but they can be a high nutrient tank because they have the bio filtration in place to consume everything and recycle it in the tank
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Ryan
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Current Tank Info: 50g Cadlights/Giesemann Spectra (250w Radium, 2 ATI Blue Plus, 2 ATI Actinic)/2 x Vortech MP10wQD/Skimz SN123/Eheim Compact 3000+
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