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CaribSea Eco-Complete
Black, heavy, mineral-rich substrate that doesn't break down. Good for low-to-medium tech.
$$ · 10–75 gal
substrate
Best Substrate for a Planted Tank
Active and inert substrate picks for a freshwater planted aquarium. Fluval Stratum vs CaribSea Eco-Complete.
Updated April 16, 2026 Amazon Associate
Every pick
The shortlist
Which one, in one line
The decision tree
If
you want faster growth and are OK replacing substrate in 2–3 years → Fluval Stratum (Planted Substrate)
If
you want a substrate that lasts forever and you're willing to dose ferts → CaribSea Eco-Complete
Compared
Side by side
| Product | Price | Key spec | Best for |
|---|---|---|---|
| Fluval Stratum (Planted Substrate) | $$ | bagSizeLb: 8.8 | 5–40 gal |
| CaribSea Eco-Complete | $$ | bagSizeLb: 20 | 10–75 gal |
Active vs inert
The choice comes down to whether you want the substrate to do chemistry or just hold plants. Both approaches grow great plants when matched to a consistent routine.
Fluval Stratum drops pH a bit, feeds plants directly from the substrate, and is easy on shrimp. It’s the default for Caridina shrimp tanks. Expect to replace it every 2–3 years as nutrients deplete and granules break down.
Eco-Complete is dense, heavy, and inert. Plants root into it well; it doesn’t shift pH. For community tanks with fish that want stable 7.0+ water, this is the correct choice. You’ll dose liquid fertilizer weekly instead of relying on substrate nutrients.
Quick answers
FAQ
- Can I mix substrates?
- Yes. A nutrient-rich cap layer over inert gravel is a classic, cheap setup. Dirt capped with sand is another common approach.
- How deep should planted substrate be?
- 1.5 to 2.5 inches for most plants. Carpet species benefit from the shallower end; heavy rooted plants like swords want the deep end.
Keep reading
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Last updated April 16, 2026 · As an Amazon Associate we earn from qualifying purchases.