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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 Stability - 4 Litre

Aquarium Additive

Seachem Stability - 4 Litre

Regular price $113.00
Sale price $113.00 Regular price
Seachem Flourish Advance - 500ml

Aquarium Additive

Seachem Flourish Advance - 500ml

4.0 out of 5 stars, 1 review
Regular price $14.44
Sale price $14.44 Regular price $17.80
Seachem Prime - 250 mL

Aquarium Additive

Seachem Prime - 250 mL

5.0 out of 5 stars, 1 review
Regular price $12.80
Sale price $12.80 Regular price
seachem flourish excel 500ml front of  bottle

Aquarium Additive

Seachem Flourish Excel - 500ml

Regular price $14.85
Sale price $14.85 Regular price
FritzZyme 7 Freshwater Nitrifying Bacteria - 16oz

Aquarium Bacteria

FritzZyme 7 Freshwater Nitrifying Bacteria - 16oz

5.0 out of 5 stars, 2 reviews
Regular price $16.10
Sale price $16.10 Regular price
Brightwell Aquatics Replenish - 500ml

Aquarium Additive

Brightwell Aquatics Replenish - 500ml

Regular price $40.30
Sale price $40.30 Regular price
Seachem Flourish Potassium - 500ml

Aquarium Additive

Seachem Flourish Potassium - 500ml

Regular price $15.45
Sale price $15.45 Regular price
Seachem Alkaline Buffer - 600 Gram

Aquarium Additive

Seachem Alkaline Buffer - 600 Gram

Regular price $16.90
Sale price $16.90 Regular price
Seachem Laboratories Seachem

Aquarium Additive

Seachem Stability - 250ml

5.0 out of 5 stars, 1 review
Regular price $11.75
Sale price $11.75 Regular price
Tropic Marin All-For-Reef - 800 Gram

Aquarium Additive

Tropic Marin All-For-Reef - 800 Gram

5.0 out of 5 stars, 1 review
Regular price $65.70
Sale price $65.70 Regular price
Tropic Marin All-For-Reef

Aquarium Additive

Tropic Marin All-For-Reef - 1 Litre

Regular price $59.10
Sale price $59.10 Regular price
seachem flourish 2 litre front of bottle

Aquarium Additive

Seachem Flourish - 2 Litre

Regular price $51.00
Sale price $51.00 Regular price
ESV B-Ionic Calcium Buffer System 2 gallon

Aquarium Additive

ESV B-Ionic Calcium Buffer System - 2 Gallon

Regular price $58.40
Sale price $58.40 Regular price
Brightwell Razor Marine front of bottle

Aquarium Additive

Brightwell Aquatics Razor Marine Cleaner - 500ml

1.0 out of 5 stars, 1 review
Regular price $28.80
Sale price $28.80 Regular price
Brightwell Phosphat-E - 2 Litre

Aquarium Additive

Brightwell Aquatics Phosphat-E - 2 Litre

5.0 out of 5 stars, 1 review
Regular price $130.65
Sale price $130.65 Regular price
Brightwell MicroBacter QuikCycl - 60ml front of bottle

Aquarium Additive

Brightwell Aquatics MicroBacter QuikCycl - 60ml

5.0 out of 5 stars, 1 review
Regular price $5.50
Sale price $5.50 Regular price
Brightwell MicroBacter Clean - 500ml

Aquarium Additive

Brightwell Aquatics MicroBacter Clean - 500ml

4.0 out of 5 stars, 1 review
Regular price $31.10
Sale price $31.10 Regular price
Seachem Flourish front of bottle

Aquarium Additive

Seachem Flourish - 500ml

Regular price $14.85
Sale price $14.85 Regular price
Brightwell Neo Nitro front of bottle

Aquarium Additive

Brightwell Aquatics NeoNitro - 500ml

Regular price $17.25
Sale price $17.25 Regular price
Red Sea Reef Energy Plus - 1 Litre

Aquarium Additive

Red Sea Reef Energy Plus - 1 Litre

5.0 out of 5 stars, 1 review
Regular price $65.99
Sale price $65.99 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.