The Malu anemone (Macrodactyla doreensis), also called the long-tentacle anemone or yellow Malu, is a sand-dwelling host anemone from Indo-Pacific reefs. Tank requirements: 100+ gallons, mature reef parameters (alk 8-9 dKH, calcium 420-450 ppm, magnesium 1300-1400 ppm). Substrate: deep aragonite sand 4+ inches - they bury their column in the sand and only the disc + tentacles are visible. Lighting: 250-400 PAR at the placement (Radion XR30 G6, Hydra HD52, or equivalent). Flow: moderate, varied, NOT direct on the disc. Feeding: target-feed silversides, mysis, krill 2-3x weekly. Compatible clownfish: clarkii, sebae, McCulloch's, allardi, polymnus. Will NOT host ocellaris or percula. Tankmate caution: potent stinging tentacles - keep fish that swim into the column at risk.
The full Q&A library answers the most-searched aquarium questions. Browse calculators and disease database for related help.
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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