It sounds like wood leaching tannins to me. Some woods, (and even corkbark) leach tannins into the water, especially in a fresh Viv. Just do frequent (twice weekly) 50% water changes until you've removed the majority of the tannins. You're water will slowly get clearer and clearer, and once the tank has properly cycled (biologically), it should run crystal clear. Good luck!
Another trick you could use is to soak the coc-fiber and then squeeze it almost dry, before placing it in the viv. That way you wash away the majority of the fine particulate matter before the fiber even gets into the viv.





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