ADA · Single nutrient
ECA Plus
Tanks where new growth has gone pale or yellow from an iron shortage.

ADA · Single nutrient
A potassium supplement that does not raise pH or KH. ADA recommends it where tap water is already high in pH and KH, and for plants that prefer softer conditions.
Updated
Tanks with pinholes in older leaves from low potassium, especially with hard tap water.
Figures from the maker's published specifications. Makers revise products, so check the current figures before buying. Photos supplied by the brand or its distributor.
ADA · Single nutrient
Tanks where new growth has gone pale or yellow from an iron shortage.
ADA · Single nutrient
Fast-growing and red plants showing pale new growth from low iron.
ADA · Single nutrient
Heavily planted, lightly stocked tanks where older leaves yellow from low nitrogen.
2HR Aquarist · Starter and bacteria
New aquasoil tanks during cycling, or after a big rescape or filter clean.
Quick answers about the ADA Green Brighty Neutral K, drawn from its specs.
Tanks with pinholes in older leaves from low potassium, especially with hard tap water.
Other fertilisers & treatments worth comparing: ADA ECA Plus, ADA Green Brighty Iron, ADA Green Brighty Nitrogen. Add any of them to the compare table to see the specs side by side.
Tap Compare on this page and on any other fertiliser or treatment you are considering, then open the compare table. It lines up every published spec side by side and lets you pick the size of each product.
From the maker's published specifications. Makers revise products, so confirm on the product page before buying.