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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

Reef Crest Part B - 1 Gallon Alkalinity Mix

Aquarium Additive

Reef Crest Part B - 1 Gallon Alkalinity Mix

5.0 out of 5 stars, 1 review
Regular price $6.15
Sale price $6.15 Regular price
Reef Crest Bulk Magnesium Chloride (2500 Gram)

Aquarium Additive

Reef Crest Bulk Magnesium Chloride (2500 Gram)

5.0 out of 5 stars, 1 review
Regular price $84.50
Sale price $84.50 Regular price
Seachem Stability - 2 Litre

Aquarium Additive

Seachem Stability - 2 Litre

Regular price $70.55
Sale price $70.55 Regular price
Seachem Reef Builder - 4 KG

Aquarium Additive

Seachem Reef Builder - 4 KG

Regular price $97.40
Sale price $97.40 Regular price
Seachem Neutral Regulator - 500 Gram

Aquarium Additive

Seachem Neutral Regulator - 500 Gram

Regular price $18.00
Sale price $18.00 Regular price
Seachem Flourish Iron - 500ml

Aquarium Additive

Seachem Flourish Iron - 500ml

Regular price $15.45
Sale price $15.45 Regular price
Seachem Flourish Trace - 500ml

Aquarium Additive

Seachem Flourish Trace - 500ml

Regular price $15.45
Sale price $15.45 Regular price
Seachem Laboratories Seachem

Aquarium Additive

Seachem Cichlid Lake Salt - 500 Gram

Regular price $16.30
Sale price $16.30 Regular price
Brightwell Reef Code A Liquid Additive - 2 Litre

Aquarium Additive

Brightwell Aquatics Reef Code A - 2 Litre

5.0 out of 5 stars, 2 reviews
Regular price $29.25
Sale price $29.25 Regular price
Brightwell Aquatics Magnesion Liquid - 500ml bottle

Aquarium Additive

Brightwell Aquatics Magnesion Liquid - 500ml

Regular price $17.60
Sale price $17.60 Regular price
Brightwell MicroBacter Clean - 500ml
new

Aquarium Additive

Brightwell Aquatics MicroBacter Clean - 250ml

Regular price $18.15
Sale price $18.15 Regular price
Seachem Betta Basics - 250 mL

Aquarium Additive

Seachem Betta Basics - 250 mL

Regular price $10.79
Sale price $10.79 Regular price $15.99
Seachem Cichlid Trace - 500ml
new

Aquarium Additive

Seachem Cichlid Trace - 500ml

Regular price $14.60
Sale price $14.60 Regular price
AquaForest KH Buffer - 5KG

Aquarium Additive

AquaForest KH Buffer - 5KG

5.0 out of 5 stars, 1 review
Regular price $52.95
Sale price $52.95 Regular price
Seachem Reef Phosphorus - 500ml

Aquarium Additive

Seachem Reef Phosphorus - 500ml

Regular price $15.00
Sale price $15.00 Regular price
Red Sea Complete Reef Care Package - Small

Aquarium Additive

Red Sea Complete Reef Care Package - Small

Regular price $101.99
Sale price $101.99 Regular price
Aqueon AquaPacs Water Conditioner - 12 Pack

Water Conditioner

Aqueon AquaPacs Water Conditioner - 12 Pack - RECENTLY EXPIRED

Regular price $4.99
Sale price $4.99 Regular price $13.55
Brightwell Aquatics MicroBacter Start XLF - 500ml

Aquarium Additive

Brightwell Aquatics MicroBacter Start XLF - 500ml

Regular price $32.15
Sale price $32.15 Regular price
Zoo Med Aquarium Leaf Litter - 1oz

Aquarium Botanical

Zoo Med Aquarium Leaf Litter - 1oz

4.0 out of 5 stars, 1 review
Regular price $9.80
Sale price $9.80 Regular price
Microbacter Start XLM - 500ml Front of bottle

Aquarium Additive

Brightwell Aquatics MicroBacter Start XLM - 500ml

5.0 out of 5 stars, 1 review
Regular price $63.40
Sale price $63.40 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.