APT Complete vs Seachem Flourish: Which Fertilizer Wins?

APT Complete covers macros and micros in a single bottle and is the better choice for most planted tanks. Seachem Flourish Comprehensive covers micros only and suits lightly planted, low-stocked tanks where fish waste provides enough nitrogen and phosphorus.

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At a glance

Spec	APT Complete All-in-One Planted Tank Fertilizer Check price on Amazon	Seachem Flourish Comprehensive Supplement Check price on Amazon
Price	$22-$35	$10-$20
Our rating	4.7 / 5	4.5 / 5
Best for	Planted tank owners who want an all-in-one solution from a trusted methodology source.	Beginners and hobbyists who want the most accessible fertilizer from a trusted brand.
Macro coverage	Full (N, P, K included)	Micros only; no significant N or P
Best for	High-tech and nutrient-hungry planted tanks	Low-tech, lightly planted tanks with fish
Price per dose	Higher per dose	Lower per dose

The two options in depth

Best Value

4.7 / 5

APT Complete All-in-One Planted Tank Fertilizer

$22-$35 mid

All-in-one liquid fertilizer formulated by the 2Hr Aquarist covering macros and micros in a single dose, designed for low-dose daily use in planted aquariums with or without CO2.

Nano Mid Large

Covers macros and micros in one bottle, eliminating multi-part dosing
Formulated by a respected planted tank methodology researcher for real planted tank needs
Suitable for tanks with or without CO2 injection

Slightly more expensive per dose than Seachem Flourish Comprehensive

Verdict The top all-in-one fertilizer for planted tanks: science-backed, simple, and effective.

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4.5 / 5

Seachem Flourish Comprehensive Supplement

$10-$20 budget

The most widely available liquid plant micronutrient supplement in the hobby, covering trace elements, amino acids, and botanical compounds used by aquatic plants weekly.

Nano Mid Large

Widely available at any pet store and on Amazon; easy to restock
Broad trace element coverage in a single supplement
Trusted brand with decades of hobby use behind it

Does not include significant nitrogen or phosphorus; macros must be supplemented separately in nutrient-hungry tanks

Verdict The most available planted tank fertilizer; a solid entry-level micronutrient supplement.

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Which should you buy?

Buy APT Complete if you want a single bottle that covers all your plant nutrition needs, especially in a CO2-injected tank with heavy plant mass. Buy Seachem Flourish Comprehensive if you are running a low-tech tank with moderate fish load and want the most widely available option from a brand you can find at any pet store.

Common questions

Can I use APT Complete and Seachem Flourish together?

You can, but there is no reason to if APT Complete is your primary fertilizer. APT Complete already covers trace elements that Flourish provides. Running both wastes money and risks over-supplementing iron and other traces.