Substrates and fertilizers for the aquarium

stabilize water,

feed plants,

support bacteria,

protect fish health.

Poorly chosen ones can cause algae, diseases, cloudy water and the death of plants and fish.

🪨 WHAT IS SUBSTRATE AND WHAT IS IT USED FOR?

Substrate is a material on the bottom of an aquarium that performs several functions:

anchors plants,

is home to nitrifying bacteria,

affects water chemistry,

creates a natural appearance of the environment.

⚙️ HOW SUBSTRATES "WORK"
🔬 Biological function

large surface = bacterial colonies

decomposition of waste

support of the nitrogen cycle

🧪 Chemical function

release of minerals

binding of nutrients

influence of pH, KH, GH

⚙️ Mechanical function

filtration of impurities

root stability

🧠 "NATURE" OF SUBSTRATES (IMAGE)

🧘 slow, stable

⚠️ sensitive to disturbance

🐌 long-lasting

❌ do not forgive bad foundation

🧱 TYPES OF SUBSTRATES
🪨 1️⃣ Inert substrates

gravel

sand

silica substrate

✔️ do not change the water

✔️ cheap
❌ no nutrition

🌋 2️⃣ Active substrates

soil substrates

clay granules

✔️ plant nutrition
✔️ pH stabilization
❌ higher price
❌ time limited effectiveness

🧱 3️⃣ Nutrient substrates

laterite

nutrient layers

✔️ strong plant growth
❌ risk of cloudiness with poor coverage

🌿 FERTILIZERS FOR AQUARIUM

Fertilizers provide plants with nutrients that:

are missing in the water,

the plants do not have time to absorb from the substrate.

🧪 HOW FERTILIZERS WORK
🌱 Macronutrients

nitrogen (N)

phosphorus (P)

potassium (K)

🔬 Micronutrients

iron

manganese

zinc

boron

⚖️ Balance

➡️ low = stagnation
➡️ high = algae

🧴 TYPES OF FERTILIZERS
💧 Liquid

✔️ fast acting
❌ short-term

💊 Tablets / capsules

✔️ root nutrition
✔️ ideal for cryptocorynes
❌ local action

🧪 Powder (PMDD)

✔️ precise control
❌ more difficult to prepare

🩺 IMPACT ON AQUARIUM HEALTH
POSITIVE

✔️ strong plants
✔️ less algae
✔️ stable water

NEGATIVE (if used incorrectly)

❌ toxins
❌ root decay
❌ fish stress

🦠 "DISEASES" OF SUBSTRATES AND FERTILIZER

bottom rot (anaerobic zones)

hydrogen sulfide release

algae bloom

bacteria loss

➡️ cause: poor circulation, overfertilization

⚖️ ADVANTAGES AND DISADVANTAGES
👍 ADVANTAGES

✅ healthy plant growth
✅ biological stability
✅ natural appearance

👎 DISADVANTAGES

❌ wrong choice = problems
❌ higher price of active substrates
❌ need for planning

🛒 HOW TO CHOOSE THE RIGHT ONE?

✔️ type of aquarium (plant, fish, habitat)
✔️ plant requirements
✔️ water hardness
✔️ budget

📌 Less is more - stability is the key.

🧭 PRACTICAL TIPS

do not rinse the substrate with hot water

lay the layers carefully

add fertilizers gradually

monitor the plants, not just the tests

📌 SUMMARY

Substrate and fertilizers are the basis of life in the aquarium.
Correctly chosen:

support the plants,

protect the fish,

stabilize the water.

Wrongly chosen:

cause algae,

decompose the bottom,