A redox level of 380-400 is good. Ozone might help the problem by destroiying anything agent that is organic in nature such as hydrocarbons but not the algacide in the silicone unless it is organic in nature. You would think the carbon would eventually adsorb/absorb all the nasties. This is also true of water changes. Having said all carbon can remove good stuff as well. Maybe if you go the water change way you could supplement the water with trace elemnts too.
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