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Wintering Koi in Repurposed Hot Tub in Tulsa

Tulsa, OK: 440-gal hot tub sunk 18-20" above ground, no liner, 31 fish (largest 9", some fancy goldfish). Asks winterizing: cover half? bring in?

Hot Tub Pond Risks

Fiberglass may leach chemicals (use pond liner).
Above-ground portion freezes deeper.
31 fish in 440 gal = crowded (koi need 1,000+ gal).

Winter Plan

De-icer + air stone near it.
Partial cover okay if gas exchange maintained.
Better: move fish indoors (stock tanks) given crowding and freeze risk.
Contact Oklahoma Koi Club for local help.

Pond and Water Gardening: Koi Behavior in Cold Water: Surface Hovering; Butterfly Koi Lethargic After New Koi Added; Recurring Red Rash on Koi in Overstocked Tank: Parasites, Bacteria, or Stress?; Dropsy in Koi: Emergency Salt, Plant Removal, and Water Quality; Wintering Koi in Minnesota: Why a Fish Bowl Failed & How to Do It Right; Overwintering Koi in Upstate NY: Indoor Aquarium Success; Building a Koi Pond: Depth Requirements and Planting Water Lilies; Converting a 400-Gallon Hot Tub to a Koi Pond; Frogs in Above-Ground Tub Ponds and Filtration Needs; Free Step-by-Step Guide to Winterizing a Pond with a Waterfall and Fish

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