Aquario Neo Solution K

A potassium top-up for plants showing pinholed or yellowing older leaves — the classic sign potassium's running short.

Potassium drives photosynthesis (the process plants use to turn light into food) and general plant metabolism, and it's one of the first nutrients plants pull from older leaves to redirect to new growth when supply runs low — which is why potassium deficiency tends to show up as pinholing (tiny holes in the leaf) or yellowing on the older, lower leaves first, while new growth still looks fine. Aquario Neo Solution K is a liquid potassium fertiliser for correcting that shortfall.

It's a targeted correction tool rather than a full fertilising base — most tanks get their potassium as part of a broader macro dose (Neo Solution 1 covers N, K, Mg and P together — nitrogen, potassium, magnesium and phosphorus, the nutrients plants consume in bulk), and Solution K is there for when you need to push potassium higher without also pushing nitrogen or phosphorus, a common situation in nutrient-rich or heavily-stocked tanks.

Aquario hasn't published an exact potassium concentration for this product, so treat any dosing rate as a guideline rather than a fixed number. Start conservative, give new growth a couple of weeks to show whether the pinholing or yellowing is clearing up, and adjust the dose to what your tank actually needs rather than dosing to a schedule regardless of symptoms.

• Liquid potassium (K) fertiliser aimed at correcting deficiency symptoms — pinholed or yellowing older leaves
• Supports photosynthesis and general plant metabolism
• Useful as a targeted correction alongside a broader macro/micro routine (pairs with Neo Solution 1)
• 300ml and 1L — dose conservatively (exact concentration not published by the manufacturer)