It’s a bit tight, but manageable. I’m thinking of drilling a hole in each container so I can refill them without moving them. Although it’s easy to disconnect the fitting to take them out. But, with 4 liters, the additives should last for months.Looks good hopefully it's easy access
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Add activated carbon on a reactor man. At this rate with your feeding and bio load am suprised it's not worst.No carbon, no GFO. Filter socks. Big clump of Chaeto growing well. Skimmer and 57W UV running 24/7. Nitrate has been at 25 and Phosphate at 0.1 for two months.