Outdoor Fantail Goldfish Pond: No Filter, No Algae Eater, Just Nature

3'x15"x9" copper fantail pond in Texas (100°F+ summers). Pump = air only. Shade under tree. Told not to feed, let them eat algae. Need bottom feeder? Filter?

Reality Check: This Setup Is Marginal

• Volume: ~25 gal. Tiny for 2 fantails + future fry.
• No Biofiltration: Air pump ≠ filter. Ammonia will kill them.
• Heat: 9" deep in Texas sun = 90°F+ water. Low O2, high metabolism.
• Fantails: Fancy goldfish are delicate. Not for tiny, hot, unfiltered tubs.

Minimum Upgrades

1. Real Filter: Small pressurized filter (Fish Mate) or DIY bucket filter with sponge + bio-media.
2. Plants: Water hyacinth (shade + nutrient uptake) + submerged (hornwort).
3. Deeper/Shadier: Move to 18–24" depth, full shade.
4. Feed Sparingly: High-quality pellets 2x/week. "No feed" = starvation in this volume.

Algae Eater? No.

Chinese algae eaters get aggressive/large. Plecos need heat. Snails (trapdoor) okay but not a fix for no filter.

Ecosystem in a Tub? Nearly Impossible.

Accept that a 25-gal tub needs equipment. It's an aquarium outdoors. Treat it like one.