Choosing Cold-Hardy Bottom Feeders for a Nova Scotia Pond

Pond Volume Reality Check

Your 4' x 8' x 3.5' fiberglass tank holds roughly 800 US gallons—decent for goldfish, tight for koi.

Bottom Feeder Options

• Plecostomus: Popular algae eaters, but die below 50°F. Not suitable for outdoor Nova Scotia winters.
• Native Catfish (Brown Bullhead, Channel Catfish): Cold-hardy, bottom-dwelling. Warning: Adults eat small fish. Only add if your goldfish are large enough.
• Suckers (White Sucker, Longnose Sucker): Native, cold-tolerant, bottom feeders. Generally peaceful.
• Loaches (Weather Loach/Dojo Loach): Tolerate cold well, active bottom scavengers. May need indoor wintering in harsh zones.

Algae Control Without Tropical Fish

Don't rely solely on fish for algae. Use plants, barley straw, proper filtration, and nutrient management. See US native fish info for more ideas (principles apply to Canadian species too).