API pH Down 4 fl oz — Nano pH Acidifier for Freshwater Aquariums - API

API pH Down 4 fl oz — nano pH acidifier for small aquariums

The API pH Down 4 fl oz is the nano format of the API pH acidifier, sized for small freshwater aquariums (nano tetras, discus, Amazon fish). Lowers pH gradually per the dosing chart on the bottle.

Specifications

• Brand: API
• Format: 4 fl oz (118 ml)
• Type: liquid pH acidifier
• Compatibility: small freshwater aquariums

How to use

• Dose per the bottle chart (typically 1 ml per 5 US gal).
• Wait 24 h and retest before the second dose.
• Never drop pH more than 0.2 points in 24 h to avoid stressing fish.

Why get this from ReefSolution

• API pH Down 16 fl oz — standard size for larger tanks.
• API Freshwater pH Test Kit — monitor during adjustment.
• API pH Up 4 fl oz — nano raiser for the opposite.

Frequently asked questions

What aquarium size does this nano format cover?

Up to about 40 L — beyond that, the 16 fl oz size is more economical.

Can I use API pH Down on a reef aquarium?

No — this is a freshwater adjuster. On a reef marine tank, use controlled CO₂ or kalkwasser to adjust pH.