5 Gallon Tank Plant-friendly substrates for a low-tech Fluval Spec V?

I think... Flourite Black Sand is still great; no need to switch.

It's inert, so it won't mess with your water params, but it holds nutrients well at the roots, which is perfect for Sagittaria and swords.

Aponogeton and swords will still want root tabs eventually since Flourite itself isn't very nutrient-rich. Wisteria doesn't care much about substrate since it feeds mostly from the water column.


Only heads up — do one thing..rinse it really well before adding; it's dustier than most substrates and will cloud a small tank like the Spec V if you rush it. Mixing in some fine gravel like you did before is still a good call for a tank that size.

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Flourite will do everything you're asking of it. The thing I'd flag is the aponogeton.

A. crispus routinely puts up leaves 15 to 20 inches long, and the bulbs sold as mixed aquarium bulbs are usually crispus or ulvaceus. In a Spec V that means it reaches the surface and then lies along it, shading whatever is underneath. The sagittaria will fill that role without the problem.

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