SPS vs LPS vs Soft Corals: A Beginner's Comparison
Walk into any coral discussion and you'll hear three letters thrown around constantly: SPS, LPS, and "softies." If your eyes glaze over, you're not alone. At Tropical Treasures in Cheyenne, we love helping new reefers figure out which corals fit their tank and their experience level — so here's the plain-English breakdown of the three big groups.
Soft corals: the easy starters 🌿
Soft corals have no hard skeleton — think mushrooms, zoanthids, leathers, and pulsing xenia. They sway in the current and are generally the most forgiving group: they tolerate lower light, less-than-perfect water, and beginner mistakes far better than their stony cousins. If you're just starting out, softies are where most reefers cut their teeth. Many even glow under blue light, which makes for a stunning first tank.
LPS: the middle ground 🪸
LPS stands for Large Polyp Stony coral — hammers, torches, frogspawn, acans, and favias. They build a hard skeleton but have big, fleshy polyps that puff up with water and food. LPS are a fantastic next step once you're comfortable: they want stable parameters and moderate light and flow, and many respond beautifully to target feeding. Just give them space — some LPS have stinging sweeper tentacles that reach out at night to zap neighbors.
SPS: the advanced showpieces ⚡
SPS means Small Polyp Stony coral — Acropora, Montipora, and birdsnest are the classics. These are the brightly colored, fast-growing corals you see in jaw-dropping reef photos, but they're also the most demanding. SPS need rock-solid stable water chemistry, strong light (high PAR), and brisk flow. They'll punish swings in alkalinity or nutrients quickly. Most reefers tackle SPS once their tank is mature and their husbandry is dialed in.
Quick comparison 📊
Soft corals — difficulty: easy; light: low to moderate; flow: gentle to moderate; best for: beginners. LPS — difficulty: moderate; light: moderate; flow: moderate; best for: intermediate reefers ready for stable parameters. SPS — difficulty: advanced; light: high; flow: strong; best for: experienced reefers with mature, stable tanks.
Which should you start with? 🤔
Our honest advice: start with soft corals and a few hardy LPS like hammers or candy canes. They'll teach you how to read your corals and keep your water parameters steady without the heartbreak of losing an expensive SPS to a beginner mistake. Once your tank has been stable for six months or more, dipping a toe into SPS becomes far less stressful.
Can you mix all three? 🦠
You can, and many beautiful reefs do — but plan your placement carefully. Put SPS up high in bright light and strong flow, LPS in the middle with room between colonies, and softies lower or in shadier spots. Watch for chemical warfare: corals release compounds to fight for space, so run a little activated carbon to keep the water clean in a mixed reef.
The bottom line 🐚
Soft corals are your forgiving starting point, LPS are the rewarding middle ground, and SPS are the showstoppers worth working up to. Match your corals to your tank's maturity and your own experience, and you'll set yourself up for success. Want help picking your first frags? Stop by Tropical Treasures in Cheyenne or call us at 307-369-1118 — we'll point you to the right corals for your reef.