If it is the DOC from the chaeto you want specifically, stressing the chaeto will cause more DOC to leak. To stress the chaeto - 1. remove some chaeto from your fuge & let it dry out a bit- to replicate low tide. 2. Re-immersing the chaeto is another stress, especially in fresh cool water (RODI). 3. Leave the chaeto in the RODI for 30 minutes, & then blend, in the RODI water, & add the RODI water to the dosing solution.