What's new

Osmocote Plus Root Tabs


New Member
Jan 22, 2019
Reaction score
How many osmocote plus root tabs would be enough for a 40 gallon breeder?

The plants that I am thinking about at this time are java fern, java moss, amazon sword, anubias, pygmy chain sword, water wisteria, hornwort, and marimo moss balls.

Thanx in advance.


Feb 25, 2009
Reaction score
It is not advisable to use these tabs in an aquarium. For one thing, they are intended for terrestrial plants which have different nutrient requirements from aquatic plants. And second they have been known to cause water quality issues. And they may/will increase nitrate which is not good for fish.

If you want substrate tabs, there is Seachem's Flourish Tabs. The API tabs are another, though there are reports of issues using these. I have never had problems with the Flourish Tabs in ten years now. [Nutrafin used to make a Plant Gro Stick which was incredible, but these are no longer manufactured for some reason, at least I cannot find them anywhere online.]

Having said that, the only plants in your list that will benefit from substrate tabs are the larger swords (Amazon swords); the Flourish Tabs do really improve growth with these plants, and you use 1 next to each plant that is replaced every 3-4 months. But Java Fern, Java Moss, Anubias and moss balls take up nutrients fro the water column so you need a comprehensive liquid fertilizer for those. And stem plants (wisteria, hornwort) will be fine with liquid fertilizer. The chain sword too, I have this thriving in my tanks with just the liquid.

For the liquid, there is Seachem's Flourish Comprehensive Supplement for the planted Aquarium. Or Brightwell Aquatics' FlorinMulti.