Your fish will love going back to the DT with all those pods. The pods will learn (all over again) that hiding during the light hours is their best defense!![]()
Pods contribute to waste nitrogen and produce ammonia. So the source of ammonia hasn't gone away.
The denitrification (nitrate to nitrogen and other organics) occurs in the live rock areas where there is a significant reduction of oxygen. The pods can be disturbing these areas, brining in oxygenated water. Also, when coralline covers the rock, it blocks off the areas of low oxygen content, also contributing to the reduced denitrification.
After the fish were removed, did you change or alter anything in the DT?



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