Bryopsis Algae is a common aquarium disease/pest affecting reef tanks. Recognizing it early and treating quickly is the difference between losing a single fish and losing an entire tank.
Symptoms to watch for
feathery green hair algae taking over rockwork. Watch for behavior changes (reclusive, refusing food, color loss) as early warning signs - even before visible symptoms appear, fish stress patterns indicate something is wrong.
Treatment protocol
Fluconazole 14-21 days, magnesium spike, manual removal. Always treat in a separate hospital tank to protect invertebrates, coral, and beneficial bacteria. Follow medication protocol exactly - underdosing produces resistance, overdosing creates new problems.
Prevention
Quarantine new fish for 4-6 weeks before adding to your display tank. Stable parameters + appropriate stocking + adequate filtration prevent the chronic stress that makes fish susceptible to disease in the first place.
When to escalate
If symptoms persist beyond expected treatment duration, parasites/symptoms reappear after treatment, or the disease spreads despite isolation, escalate to a fish-specific veterinarian or experienced reef keeper. Aquatic veterinarians offer prescription medications (chloroquine, levamisole) not available over-the-counter.
Bryopsis Algae FAQ
Is bryopsis algae contagious?
Pests can spread between corals; isolate infested specimens immediately.
Can I treat in the display tank?
For most diseases - no. Copper kills inverts, antibiotics destroy beneficial bacteria. Always treat in a hospital tank.