Medium Alder Cones (70 Pack)

Our Castle Dawn Aquatics Alder Cones (Alnus glutinosa) are sustainably collected from the Irish countryside and are one of the most loved botanicals for natural aquarium setups. Known for their high tannin content, they help replicate soft, acidic blackwater environments while releasing beneficial compounds that support fish and invertebrate health.

With their naturally textured surface, alder cones cultivate rich biofilm and fungal networks, providing essential grazing material for shrimp, plecos, and small bottom-dwelling fish. As they slowly decompose, they release tannins, humic acids, and antioxidants, supporting soft-water species and encouraging natural behaviours such as grazing and breeding.

Their ability to lower pH makes them a sustainable and natural alternative to peat moss, perfect for Betta, dwarf cichlid, and shrimp tanks.

Tannins Released: High

All our botanicals are organically sourced, free from harmful pesticides and naturally sun-dried without the use of chemicals.

Key Features and Important Notes:

• What’s Included:
   1 × Pack of Alder Cones (choose quantity when ordering)
  ⚠️ For aquarium use only – not for human consumption.
• Average Size:
  3.5 cm (1.4 inches)
• Source:
  Ireland
• Flora:
  Alnus glutinosa (Alder Tree)
• High in Beneficial Compounds:
  Contains tannins, humic acids, polyphenols, and natural antioxidants that promote fish health and strengthen biological balance.
• Natural pH Reduction:
  Gradually softens and acidifies the water, ideal for shrimp and blackwater aquariums.
• Biofilm Development:
  Promotes the growth of biofilm and detritus that serve as a food source for shrimp and bottom feeders.
• Sustainable & Eco-Friendly:
  Collected from naturally fallen cones and sun-dried without chemicals. A great alternative to peat moss for sustainable aquarium keeping.
• Preparation:
  Boil for 30 minutes, then soak in cold water overnight before adding to your aquarium.
• Durability:
  Long-lasting botanical that decomposes slowly, maintaining visual appeal and biological benefits over time.
• Variability:
  As a natural product, colour, shape, and size may vary slightly between cones.
• Conservation Support:
  Part of the Wild Betta Rescue Programme – your purchase helps fund habitat protection and restoration efforts in Southeast Asia.