Ca Plus 250 ml — Concentrated Liquid Calcium for Reef Aquariums - Aquaforest

Aquaforest Ca Plus 250 ml — fast liquid calcium solution for reef aquariums

The Ca Plus 250 ml is Aquaforest's standard liquid calcium solution, tuned for quick top-up dosing on reef tanks. It delivers ionic calcium immediately available for coral biomineralization, without introducing competing trace elements the way a full Component A does. Ideal to lift a falling calcium, correct a small deficit between water changes, or set up a simple calcium routine on a nano reef.

The 250 ml format suits tanks up to 100-200 L in moderate dosing. Paired with KH Plus and Mg Plus, it makes up the simplified Aquaforest trio for hobbyists who prefer three targeted bottles to the Components 1+2+3+ trio.

When to use Ca Plus

• Fast calcium drop — 380 ppm or lower, gradual lift toward 420-440.
• Between-water-change top-up — when the salt routine no longer keeps up.
• Simple Balling alternative — Ca Plus / KH Plus / Mg Plus trio on nano or LPS.
• Add-on to an existing Reef Mineral Salt scheme — Ca Plus + RMS + separate KH Plus method.

Aquaforest official dosing

• Starting dose: 5 ml per 27 US gal (100 L) of tank water, per day.
• Measurable effect: 10 ml in 100 L raises calcium by about 15 ppm (mg/L).
• Maximum dose: 20 ml per 100 L per day — ceiling to respect.
• Tuning: in 1-2 ml per 100 L steps based on weekly tests.
• Caution: add in a high-flow area to avoid local precipitation with carbonates.

Parameter targets

• Recommended calcium: 380-460 ppm (aim 420-440 on SPS).
• Watch Ca/Mg ratio — Mg should never drop below 1,180 ppm.
• Never raise Ca by more than 50 ppm in 24 h — precipitation risk.

Specifications

• Brand: Aquaforest (Poland)
• Format: 250 ml bottle
• Type: standard liquid calcium solution
• Compatibility: nano reefs, LPS and soft coral tanks, SPS top-ups

Why choose Aquaforest at ReefSolution

• Lab Ca Plus 2 L — the concentrated large-format version for established tanks with sustained consumption.
• KH Plus 250 ml — the alkalinity solution to dose alongside for KH-Ca stability.
• Mg Plus 250 ml — the magnesium that closes the simplified trio.

Frequently asked questions

Can Ca Plus fully replace Balling?

On a nano or soft coral tank, yes — the Ca Plus / KH Plus / Mg Plus + Reef Mineral Salt trio holds reef stability well. On high-growth SPS, adding Reef Mineral Salt as a stock solution becomes tighter and classic Balling stays preferable to avoid ionic drift.

How long does a 250 ml bottle last on a nano?

At the 5 ml/100 L starting dose on a 30 L nano, daily consumption is 1.5 ml — the bottle lasts about 165 days (5.5 months). On a 100 L tank, duration drops to about 50 days.

Should I test calcium every day after Ca Plus dosing?

No — a weekly test is enough on a stable tank. On a tank just starting dosing, twice-weekly tests help validate the right dose before going into routine. Avoid overdosing which triggers abiotic calcium carbonate precipitation.