Sudden Die-Off After Walmart Lily: Chemical Contamination & Pump Timing

15-yr balanced pond, sudden total fish/tadpole death after Walmart lily + barley ball. Lily likely chemically treated. Pump running 2 hrs/day = low O₂.

Lily Contamination

• Commercial lilies often treated with pesticides/fungicides.
• No fish in grow-out = no safety testing.
• Flush new plants: separate container, daily water changes × 1 week.

Pump Timing

• 2 hrs/day = stagnation → methane, low O₂, waste buildup.
• Run 24/7 — or at least 10 hrs.

Recovery

1. Drain & refill before restocking.
2. Toad eggs: Move to bucket with pond water — they'll hatch.
3. Restock slowly — quarantine, test.

Walmart lily + low pump time = chemical kill + suffocation. Flush plants. Run pump. Nature balanced until you disrupted it.