What TDS is best for keeping vs. breeding Discus fish?

For adult display tanks, a TDS of 120–180 ppm (GH 3–6, pH 6.2–6.8) is ideal. For breeding pairs, lower the TDS with RO water to 50–90 ppm (GH 1–2, pH 5.6–6.2) so eggs do not calcify.

How do you treat Hexamita (white stringy poop) in Discus?

Slowly raise water temperature to 31–32 °C (88–90 °F) with heavy aeration for 5–7 days and dose metronidazole (250 mg per 40 L daily after a 30% water change, or soaked into pellets).

指南中级阅读约 12 分钟2026年10月28日

七彩神仙鱼饲养全攻略：RO纯水TDS参数、30°C恒温、UV大滤筒与头洞病（六鞭毛虫）预防

零损耗养好七彩神仙鱼：详解RO反渗透水TDS/GH/pH黄金标准、29–31°C高温抑制六鞭毛虫的生理机制及UV变频大滤筒配置。

Discus Fish Care Guide: RO Water Parameters, 30°C Temperature & Hexamita Prevention — aquarium guide — Wikimedia Commons / CC BY-SA

七彩神仙鱼（Symphysodon aequifasciatus）被誉为观赏鱼之王。要想避免黑体、缩鳍与头洞病（六鞭毛虫 Hexamita），核心在于三大支柱：RO反渗透软酸水（TDS 100–180 ppm，pH 6.2–6.8）、全年恒定29–30°C高温，以及带UV杀菌灯的大流量变频滤筒。

1. RO纯水调配与TDS/硝酸盐精准监测

使用高精度TDS水质测试笔监控换水硬度，并配合多合一水质测试条将硝酸盐严格控制在15 mg/L以下。

纯水/养虾必备$1 – $3

高精度数字TDS水质硬度/电导率检测笔

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7合1快速试纸$3 – $5

7合1水族箱水质检测快速试纸

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2. 30°C恒温防头洞病与UV变频滤筒

使用精准温控防爆加热棒维持29–30°C可激活七彩肠道免疫力，搭配Sunsun HW-3000液晶变频UV外置滤筒彻底净化水体杂菌。

恒温防爆$7 – $12

水族箱自动恒温潜水加热棒

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旗舰变频大流量$120 – $160

森森 HW-3000 专业变频外置过滤桶

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常见问题

What TDS is best for keeping vs. breeding Discus fish?: For adult display tanks, a TDS of 120–180 ppm (GH 3–6, pH 6.2–6.8) is ideal. For breeding pairs, lower the TDS with RO water to 50–90 ppm (GH 1–2, pH 5.6–6.2) so eggs do not calcify.
How do you treat Hexamita (white stringy poop) in Discus?: Slowly raise water temperature to 31–32 °C (88–90 °F) with heavy aeration for 5–7 days and dose metronidazole (250 mg per 40 L daily after a 30% water change, or soaked into pellets).