Remineralising RO/RODI water is critical for aquarium health, but not all remineralisers are created equal. A detailed comparison of APT SKY vs APT SKY PLUS by 2Hr Aquarist offer high-quality solutions tailored to specific aquatic needs. Here’s how to choose wisely based on species, water chemistry, and aquascaping goals.
? Shared Strengths
Both APT SKY and APT SKY PLUS deliver:
- Replenish essential minerals like Calcium (Ca) and Magnesium (Mg).
- Support the growth of softwater and hardwater plants.
- Enhance shrimp health and reproduction.
- Do not alter NPK values, preserving your fertiliser balance.
- Are ideal for use with RO/RODI water.
? Which One Should You Choose – APT Sky vs APT Sky Plus?
| Criteria | APT SKY | APT SKY PLUS |
|---|---|---|
| Water Parameter | Softwater | Normal / Hardwater |
| KH Impact | No change in KH | Raises KH to ~2 dKH |
| pH Impact | Neutral | Buffers pH to 7.2–7.6 |
| GH Impact (5ml/60L) | +2.5 dGH | +1.8 dGH |
| Calcium Content | 21.5% | 16.6% |
| Magnesium Content | 5.4% | 3.5% |
| Best for | Caridina shrimps, Tetra species of fishes, Tonina, Syngonanthus, other softwater plant species | Neocaridina shrimps, snails, Guppies, mollies, Vallisneria, Pogostemon helferi, other hardwater plant species |
| Use Case Scenario | GH-only boost | GH + KH/pH boost |
| Trace Elements | Higher trace mix | Slightly reduced trace concentration |
| GH Tolerance | Accommodates wide GH range with low KH | Adds GH + mild KH; stays within softwater plant tolerance |
| Example Setup | Blood vomit (Centrolepis drummondiana), Cryptocoryne | Mixed tanks with shrimp, mollies, and Vallisneria |
? Real-World Insight
APT SKY PLUS introduces just enough KH (around 2dKH) to buffer sharp pH drops, while staying within tolerances of softwater plants—making it a versatile choice for mixed-species tanks. Many plant species thrive in GH levels of 5+ dGH, especially Rotala florida, Cryptocoryne flamingo, and other Crypts.
APT SKY, meanwhile, is precision-formulated for setups where KH must remain minimal—even in the face of aggressive aquasoils.
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