JBL ProAquaTest Mg Magnesium Freshwater & Refill

The drip test takes maybe five minutes and the color chart is dead simple to read, which is a relief after fumbling with other kits. My plants finally stopped showing that pale, stunted look once I dialed in the magnesium level. Refill bottle lasts a good while too, so I'm stocked for months.

Dosing my planted tank felt like guesswork before, but this magnesium test finally pinpoints exactly what my fertilizer routine is missing. The refill is easy to use and gives clear, readable results in minutes, so I can correct levels without stressing the fish.

Picked up this refill after my last kit ran out, and it's nice that the test count matches the original, so I can keep checking my magnesium levels without guessing.