Red bugs (Tegastes acroporanus) are tiny copepod-like crustaceans that infest Acropora coral. Yellow-orange specks on the surface; cause polyps to retract and growth to slow.
Hitchhiked in on un-dipped Acropora frags. Spread between Acropora pieces via water column.
Always treat in a separate quarantine tank.
Dip every Acropora frag before placement. Quarantine new SPS for 30 days.
Tiny yellow-orange specks crawling on Acropora surface. Acropora polyps retracted or pale. Slow or stalled growth.
Hitchhiked in on un-dipped Acropora frags. Spread between Acropora pieces via water column.
Interceptor (milbemycin oxime): Veterinary heartworm medication used at 25 mg per 10 gallons. Effective in one dose for adults; second dose 7 days later for hatchlings. Toxic to crustaceans (CUC).
Dip every Acropora frag before placement. Quarantine new SPS for 30 days.
Moderate - slows SPS growth, rarely fatal
Browse the full disease database for 45 aquarium conditions with treatment protocols, or check the care library for prevention-focused husbandry guides. Use our symptom matcher to rank likely diseases from observed signs, the water parameter checker to diagnose related water-quality issues, or the QT timeline calculator to plan a treatment schedule.
Whatever specific topic brought you here, four fundamentals govern long-term aquarium success: water quality, parameter stability, biological filtration, and species-appropriate husbandry. Skip any one and the others struggle to compensate.
Water quality: ammonia + nitrite at zero, nitrate under 30 ppm freshwater + 10 ppm reef. Test weekly with API or Salifert kits. Use our water parameter checker to score your readings against your tank type.
Parameter stability: stable wrong parameters beat fluctuating ideal parameters. Most fish tolerate a wide pH range if it's stable. Sudden swings of 0.4+ pH or 5+°F kill fish faster than chronic suboptimal values. Use temperature controllers (Inkbird) + automated dosing for consistency.
Biological filtration: the bacterial colony on your filter media + rock + substrate is the engine. Never replace all media at once. Use our filter turnover calculator to size correctly.
Species-appropriate husbandry: research adult size, territoriality, diet, and tankmate compatibility before purchase. Use our tank stocking calculator + compatibility guides.
How long does an aquarium take to set up? 4-6 weeks for full cycling + first stocking. Use our cycle ETA calculator + how long does cycling take.
What's the best aquarium for beginners? 20-gallon long. Big enough for parameter stability, small enough for budget + space. See beginner picks.
How often should I do water changes? 25-30% weekly. See water change frequency Q&A + water change calculator.
Why does my fish keep dying? 5 leading causes: uncycled tank, wrong species pairings, no quarantine, undersized tank, neglected water-change schedule. See full diagnosis.
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