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Collection: Additives

Reef, freshwater, and planted tank supplements: calcium, alkalinity, trace elements, plant fertilizers, bacteria, and conditioners. Test first, then dose to what the water actually needs.

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260 products

SeaChem Prime - 500 mL

Aquarium Additive

Seachem Prime - 500 mL

5.0 out of 5 stars, 3 reviews
Regular price $24.35
Sale price $24.35 Regular price
Seachem Prime - 4 Litre

Aquarium Additive

Seachem Prime - 4 Litre

5.0 out of 5 stars, 1 review
Regular price $130.45
Sale price $130.45 Regular price
Brightwell Aquatics MicroBacter Purple M - 500ml

Aquarium Additive

Brightwell Aquatics MicroBacter Purple M - 500ml

5.0 out of 5 stars, 2 reviews
Regular price $35.30
Sale price $35.30 Regular price
Tropic Marin All-For-Reef - 1600 Gram

Aquarium Additive

Tropic Marin All-For-Reef - 1600 Gram

5.0 out of 5 stars, 6 reviews
Regular price $101.95
Sale price $101.95 Regular price
Seachem Flourish Tabs - 10 Pack

Aquarium Additive

Seachem Flourish Tabs - 10 Pack

Regular price $12.20
Sale price $12.20 Regular price
FritzZyme 7 Freshwater Nitrifying Bacteria - 32oz

Aquarium Bacteria

FritzZyme 7 Freshwater Nitrifying Bacteria - 32oz

5.0 out of 5 stars, 2 reviews
Regular price $28.55
Sale price $28.55 Regular price
SeaChem Stability - 500ml

Aquarium Additive

Seachem Stability - 500ml

4.0 out of 5 stars, 1 review
Regular price $22.20
Sale price $22.20 Regular price
Brightwell MicroBacter7 - 500ml bottle

Aquarium Additive

Brightwell Aquatics MicroBacter7 - 500ml

4.3 out of 5 stars, 4 reviews
Regular price $29.35
Sale price $29.35 Regular price
Seachem Flourish Tabs - 40 Pack

Aquarium Additive

Seachem Flourish Tabs - 40 Pack

5.0 out of 5 stars, 1 review
Regular price $36.70
Sale price $36.70 Regular price
FritzZyme 7 Freshwater Nitrifying Bacteria - 8oz

Aquarium Bacteria

FritzZyme 7 Freshwater Nitrifying Bacteria - 8oz

5.0 out of 5 stars, 1 review
Regular price $9.60
Sale price $9.60 Regular price
Seachem Prime - 2 Litre

Aquarium Additive

Seachem Prime - 2 Litre

5.0 out of 5 stars, 3 reviews
Regular price $76.40
Sale price $76.40 Regular price
API Leaf Zone - 16oz

Water Treatment

API Leaf Zone - 16oz

5.0 out of 5 stars, 1 review
Regular price $12.75
Sale price $12.75 Regular price
Seachem Equilibrium - 600 Gram

Aquarium Additive

Seachem Equilibrium - 600 Gram

5.0 out of 5 stars, 1 review
Regular price $17.25
Sale price $17.25 Regular price
Brightwell MicroBacter7 - 2 Liter bottle

Aquarium Additive

Brightwell Aquatics MicroBacter7 - 2 Liter

4.0 out of 5 stars, 2 reviews
Regular price $80.60
Sale price $80.60 Regular price
Brightwell MicroBacter Start XLM - 250ml front of bottle

Aquarium Additive

Brightwell Aquatics MicroBacter Start XLM - 250ml

5.0 out of 5 stars, 1 review
Regular price $34.70
Sale price $34.70 Regular price
AquaForest Magnesium - 4KG

Aquarium Additive

AquaForest Magnesium - 4KG

5.0 out of 5 stars, 1 review
Regular price $49.95
Sale price $49.95 Regular price
SeaChem Pristine - 500ml

Aquarium Additive

Seachem Pristine - 500ml

Regular price $25.60
Sale price $25.60 Regular price
Brightwell NeoPhos front of bottle

Aquarium Additive

Brightwell Aquatics NeoPhos - 500ml

Regular price $17.20
Sale price $17.20 Regular price
Red Sea NO3-PO4-X - 1000ml

Aquarium Additive

Red Sea NO3-PO4-X - 1000ml

4.5 out of 5 stars, 2 reviews
Regular price $53.99
Sale price $53.99 Regular price
Brightwell Phosphat-E - 250ml

Aquarium Additive

Brightwell Aquatics Phosphat-E - 250ml

5.0 out of 5 stars, 1 review
Regular price $38.55
Sale price $38.55 Regular price

Dose What You Measure

Adding supplements without testing is guesswork. A reliable test kit tells you what your water is actually short on — then you dose to correct it and retest to confirm. That order keeps parameters stable instead of swinging.

Additives by Tank Type

  • Reef and marine — calcium, alkalinity, and magnesium to replace what growing corals consume, plus trace elements.
  • Planted and freshwater — complete and iron fertilizers, substrate tabs, and liquid carbon sources.
  • New setups — beneficial bacteria and cycling boosters to establish biological filtration.
  • Every water change — conditioners that neutralize chlorine and chloramine from tap water.

Match the additive to the livestock and plants you keep, and keep dosing consistent — small regular amounts beat large occasional corrections. Questions about building a dosing routine? Email info@jlaquatics.com.

J&L Aquatics was formed in December 1997

Our business was started from our love of the aquarium hobby. We at J&L Aquatics felt that the Canadian aquarist should have the option to purchase top quality supplies, equipment and livestock other than the generally over priced local retail stores.