Anthurium on Lava Rock: Brown Spots from Overwatering and Water Quality

Issue

Anthurium on lava rock kept in 1/4" water constantly. Bright indirect light. Leaves develop expanding brown spots.

Constant wetness: Anthuriums need drying cycles. Let rock dry between waterings.
Water chemicals: Chlorine/fluoride cause spotting. Let tap water sit 48 hours before use.

Hawaiian volcanic soil drains well; not constantly submerged.

House Plants: Drosera adelae Disaster: Freeze, Fertilizer Burn, Sun Scorch, and Drought—Is It Dead?; How to Propagate an Overgrown Anthurium: Pruning vs. Division; Reviving a Dying Anthurium: Watering, Pests, and Root Health; Why Your Anthurium Has Brown Leaf Tips and Stops Flowering; Ficus Leaf Drop: Watering by Weight and Light Needs; Water Softener Damage to Hawaiian Ti Plants: Flushing Salts and Adjusting Care; Care Guide for Two Mystery Funeral Plants: Alocasia and Dracaena; Pitcher Plant Care: No Fertilizer, Pure Water, Live Insects Only; Anthurium in Lava Rock: Remove from Water Bowl, Use Distilled Water; Anthurium Care: Fixing Brown Leaves and Watering Issues

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