Ich in a New 50-Gallon Pond: Natural Immunity Over Medication

A new 50-gallon shaded pond (32 small goldfish, 10 snails, 10 clams, 40% plant cover, no filter) has one fish with ich. Owner lacks test kits, asks about treatment safety for invertebrates and UV use.

Avoid Ich Medications

Most ich remedies (malachite green, formalin, copper) harm snails, clams, plants, and beneficial bacteria. In a new, unfiltered system, they crash the ecology.

Better Approach

• Optimize water quality: Test for pH, ammonia, nitrite, nitrate, phosphate, alkalinity, salt.
• Add salt: 0.1–0.3% (1–3 lbs/100 gal) non-iodized salt boosts fish immunity and disrupts ich lifecycle.
• UV clarifier: Slow flow for parasite kill; faster flow for green water. Size appropriately.
• Let nature work: Healthy fish in clean water often clear ich naturally and gain immunity.

Heater Note

Coastal CA rarely freezes; heater unnecessary unless keeping tropical species.

Buy a master test kit first. Data drives decisions.