Alder Cones are supposed to help lower pH and prevent fungal infections when added to an Aquarium. They do release a lot of tannins and noticeably darken your water.
The small cones release a lot of tannins and will noticeably darken your water. The large cones are several times the size but do not release many tannins. Both the large and small cones provide space for biofilm to grow.
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