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After only 6 days one can obviously see how fast these plants are growing. Thanks to adding ferts every 2 days plants can't lack any nutrients they need for a healthy growth. Maintaining the same CO2 level is of a great importance. CO2 shifts stress plants and will favour the Black Beard Algae (BBA). I perform 45% weekly water change to prevent any nutrient build-up. So far everything looks great. I will add a few Caridina gracilirostris very soon ;-)