ThriveCaps Aquarium Root Tab/Caps NA Premium 60 Count (2x60ct Jars) Review (2026)

Who these root tabs are for

ThriveCaps target aquascapers growing root-feeding plants such as Amazon swords, Cryptocoryne, Vallisneria and Tiger Lotus, species that draw a meaningful share of their nutrients through the root system rather than purely from the water column. Anyone running an inert substrate like plain gravel or sand, which holds no nutrient charge on its own, benefits the most, since root tabs become the main way to feed those plants at the base. The two 60 count jars give enough capsules to cover a fairly large planted layout or restock a smaller tank multiple times over a year, which suits a keeper who wants to buy once and not reorder every few months. Someone with only a couple of stem plants and no true root feeders will get less value from a bulk two-jar pack than a smaller single jar.

What is in the capsule and how it is dosed

The formula combines a proprietary nutrient mix with iron-rich clay and mineralized topsoil, aiming to supply both the macro and micronutrients root-feeding plants need over an extended period. Each capsule is rated at 1 gram, and the two-jar bundle totals 120 capsules between them. The recommended approach is to place one capsule near the base of each rooted plant, or to space capsules roughly 5 to 6 inches apart in a grid pattern for broader substrate coverage. Capsules should be pushed down into the substrate as far as practical, ideally close to the bottom of the tank, so the nutrients release gradually near the root zone rather than dissolving into open water where they could feed algae instead of plants.

Using and maintaining a root tab routine

Because the capsules are designed to stay fully buried, the main technique to get right is pushing them deep enough that substrate vacuuming or root disturbance does not expose them early. A blunt planting tool or the capped end of aquascaping tweezers works for pushing capsules into sand or fine gravel without disturbing nearby roots too much. Seachem-style tabs and other capsule root feeds share this same risk of floating to the surface if buried too shallow, especially in looser substrates, so firm placement close to the glass or against a hardscape piece can help anchor them. Manufacturer guidance points to replacing capsules roughly every 3 to 4 months, or sooner if plant growth clearly slows, which lines up with how most root tab nutrient loads are designed to deplete over a typical planted tank feeding cycle.

How it compares with cheaper root tab options

Against Osmocote-based tabs from brands like Blue Lake, which are widely used and inexpensive per tab, ThriveCaps cost more per dose because of the more concentrated, aquarium-specific formula and the clay and topsoil components. Blue Lake's 100 count and larger jars are priced to be replaced often and in bulk, which suits keepers who do not mind reordering, while the ThriveCaps two-jar bundle leans toward buying a larger supply less frequently. Both approaches work for root feeding in a planted tank, and the choice mostly comes down to whether a keeper prefers a lower cost per tab or a smaller number of higher concentration capsules that need less frequent restocking within a single order.

Verdict and who might want a different root tab

For a planted tank with real root feeders and an inert substrate, this two-jar bundle gives a long runway of capsules without needing to reorder soon, and the capsule format is simple to push into place. It earns its strong score mainly on how well it fits that specific job rather than on being the cheapest option available. A keeper on a tight budget who only needs a handful of tabs for one or two plants would likely do better with a smaller count jar or a basic Osmocote tab pack like Blue Lake's, since the per-tab cost is lower even though the formula is simpler.

Frequently asked questions