Planted tanks Fluval Fish & Aquatic · Decor & Plants

Fluval

Fluval Bio-Stratum Volcanic Soil Substrate, 8.8 lb

Planted tanks

Best for: Starting a planted freshwater aquarium

A nutrient-rich volcanic soil designed for live plants, with beneficial bacteria to help a new tank cycle. It gives roots something to grow in that plain gravel can't.

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Other sizes on Amazon: 4.4 lb17.6 lb

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What we like

  • Feeds rooted plants
  • Helps start the nitrogen cycle
  • Doesn't compact

Keep in mind

  • May cloud water at first; fill slowly
  • Can lower pH, which some fish dislike

Our in-depth look

Who it's for

Freshwater keepers starting a planted tank with rooted plants.

Who should skip it

Tanks for fish that need hard, alkaline water, since soil substrates can soften and acidify water.

Tips

Rinse gently or not at all (follow the bag). Fill the tank slowly over a plate or bag to avoid clouding.

Key features

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Questions owners ask

Do I need to rinse it?

Follow the instructions on the bag; heavy rinsing can break the soil down.

How deep should it be?

Around 2–3 inches is common for planted tanks.

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