The first 12 months of a reef tank are the hardest. Parameters swing, equipment quirks reveal themselves, and the keeper is still learning what "stable" looks like. The wrong starter corals (most acropora, demanding LPS, sensitive anemones) bleach, brown out, or die during this learning curve - taking $200-2,000 worth of livestock with them.
The right starter corals tolerate the swings. They color up under modest light, recover from brief parameter excursions, and forgive imperfect flow. Build the first reef on these species, develop the discipline to maintain alkalinity and salinity, and add demanding species in year 2.
Toadstool leather (Sarcophyton), green star polyps, zoanthids, mushrooms (Discosoma, Rhodactis), pulse Xenia. All tolerate the parameter swings of new tanks. 5-8 specimens cover the lower third of the tank inexpensively ($50-150 total).
Trachyphyllia (open-brain), candy cane (Caulastrea), hammer (Euphyllia parancora), torch (E. glabrescens), acanthastrea. Moderate light requirements (100-200 PAR), gentle flow, target-feeding accelerates growth. $30-80 per specimen.
A $30 frag from a vendor with a documented Trust Score is a better starter than a $200 colony - if it dies, you learn the lesson cheap. Most beginners lose 1-3 corals in their first year. Plan budgets accordingly.
Montipora capricornis (cap, plate-form) is the standard "first SPS" - tolerates more parameter variability than acropora, colors up under modest light, propagates easily. $40-100 per specimen.
Soft coral spreads. Leathers grow 2-3x in 6 months. Hammer coral expands sweeper tentacles 6 inches at night. Plan placement with 4-6 inches of margin around each specimen so colonies don't collide as they grow.
Alkalinity stability is the #1 factor in coral health. Test 2-3 times per week, target 8.0-9.0 dKH, hold within 0.3 dKH. A swing from 8.5 to 7.0 in 24 hours will trigger STN on sensitive corals.