Acorn Caps (English Oak) High Tannins ( 35-40 pcs )

Acorn Caps from English Oak are a powerful, all-natural aquarium botanical known for their exceptionally high tannin content. Widely used by shrimp keepers, fish breeders, and blackwater aquascapers, these caps help create stable, natural freshwater conditions while providing grazing, shelter, and breeding benefits.

Once submerged, English Oak acorn caps release dark tannins and humic substances that can help lower pH, reduce stress, and mimic the natural habitats many shrimp and fish species thrive in. Their compact, cup-like shape makes them ideal micro-hiding spots for shrimp, fry, and eggs, while the surface quickly develops biofilm and beneficial microorganisms.

Acorn Caps are especially effective in Caridina shrimp tanks, betta breeding setups, nano fish aquariums, and true blackwater biotopes.

Key Benefits

• Very high tannin release for authentic blackwater conditions

• Supports shrimp health, moulting & natural behaviour

• Encourages biofilm & microorganism growth

• Provides shelter for shrimp, fry & fish eggs

• May help lower pH naturally (depending on setup)

• Long-lasting & slow to break down

• 100% natural – no chemicals or additives

Commonly Used For

• Caridina & Neocaridina shrimp

• Betta, tetras, rasboras & other nano fish

• Fish breeding & fry protection

• Blackwater & biotope aquariums

How to Use

Rinse thoroughly before use. For faster sinking and stronger initial tannins, boil for 5–10 minutes. Add directly to the aquarium. Replace once fully broken down.

⚠️ Note: Due to high tannin release, start with small quantities and monitor water parameters.