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Starting with soft corals
After a reef cycle finishes and ammonia and nitrite read zero, many tanks start with soft corals. Most of them lack a hard calcium skeleton, so they pull less on alkalinity and calcium than SPS (small-polyp stony), and light and flow are easier to land in a “good enough” range. Below is a practical starter path—what to pick, where to put it, and the usual pitfalls. Cycling itself is in reef cycling to first fish.
When softies make sense?
Softies forgive more than SPS, but they still need a finished cycle. With ammonia or nitrite still present, polyps stay closed and tissue can melt. A common point to start: ammonia and nitrite at zero for several days, a small crew already in, temperature and salinity steady—then the first soft coral.
Nitrate does not need to sit near zero. Many softies that beginners often keep look better around 5–20 ppm; a huge water change that strips nutrients can make them shrink harder. Hold alkalinity steady first (about 7–9 dKH); that matters more than chasing calcium every day.
During the brown-to-green algae phase, one hardy mushroom coral or a small zoa patch is fine—but keep numbers small while algae is still heavy.
Which softies to start with?
These are the groups shops and online lists usually offer first:
| Kind | Why it works early | Watch |
|---|---|---|
| Mushroom coral | Opens under low to moderate light; gentle on flow | Move up slowly under bright light; harsh flow keeps them shut. Large colonies can cover nearby rock. |
| Zoanthid / button polyp | Colorful, fast-growing, fine with mid light and mild flow | Some groups may carry anemone toxins—gloves and eye protection. Nudibranchs hitchhike often; clean them before display. |
| Leather coral (toadstool types) | Hardy; mid light and mid flow; easy to recognize | Sheds a waxy film on a cycle—needs flow to clear it. Leave room to grow. |
| Xenia, green star coral, and similar | Pretty motion; common in new tanks | Spread very fast and can blanket rock. Keep them on a removable frag rock, or skip them at the start. |
The first batch does not need to be a set. One mushroom coral or a small zoa patch is usually steadier than a row of rare morphs. LPS (large-polyp stony—hammers, frogspawn, and kin) and SPS (small-polyp stony) can wait; softies are enough to learn light, flow, and stability.
Light, flow, and alkalinity?
Most softies live mainly on light through their symbionts. Occasional meaty food helps, but for a first tank, placement beats daily target feeding.
- Light: most mushroom corals do fine in low to mid light; zoas and leather corals usually sit in the mid-light band. As a rough PAR band, about 50–150 covers many starters. Put a newly bought coral lower in the tank, where light is weaker; after about one to two weeks, if it looks settled, move it higher—sudden intensity can bleach or keep polyps shut.
- Flow: indirect, irregular flow beats a direct blast. Too hard and polyps cannot open; too dead and mucus and detritus sit on the surface. Leather corals especially need enough flow to shed their film.
- Alkalinity: about 7–9 dKH, and keep it steady. Softies do not “eat” much calcium, but swinging alk stresses the whole tank.
- Salinity and temperature: 1.024–1.026 SG, about 24–26 °C. Evaporation removes freshwater only—top it back up with RO/DI. Do not top off evaporated water with mixed saltwater, or salinity will climb.
Testing and top-off habits can follow the tables in reef cycling to first fish.
Where to place them?
Think by height:
- Lower / shaded side: mushroom corals and some darker zoas. Dimmer light often means fuller expansion.
- Mid: the safe default for most zoas and toadstool leather corals. Sweep flow from the side; avoid aiming a wavemaker straight at them.
- Upper: only for pieces already used to bright light—not for day-one frags.
Leave gaps between softies, and between softies and LPS. Some zoas and leather corals release chemistry that keeps neighbors shut. If keeping green star coral or Xenia, mount them on a frag rock you can lift out later.
Coral glue or epoxy is fine; rinse crumbs and let it cure before strong flow. For a short watch, rest the frag on a shelf first, then glue once it opens.
Before they go in?
Softies often fail less from “hard care” than from pests entering the display. Zoanthid nudibranchs and sundial snails, flatworms on mushroom corals and leather corals, and hitchhiking crabs are easy to miss.
- Quarantine: two to four weeks in a separate tank when you can. Without one, still watch a few days—do not glue to the main rock the day it arrives.
- Dip: follow a coral dip product’s directions; no brand names here. Wear gloves; do not pour waste into the display or straight down a drain that reaches waterways. Extra care with zoas around eyes and cuts.
- Drip acclimation: bag water and display water often differ. Drip toward display parameters before placing—steadier than a straight pour.
In the first week, disturb them less: no big light jumps, no daily moves. A few closed days are common; if they stay collapsed and tissue melts, check ammonia, salinity, and neighbor distance.
Things to watch
| What you see | Likely why | What to try |
|---|---|---|
| Shut for a long stretch | Direct blast, light jumped, neighbors too close | Sideways gentler flow, ease light, space aggressive neighbors |
| Bleached or glassy | Light rose too fast, or a hard water change | Move down, hold steady, avoid stripping nutrients in one change |
| Zoas going bald in patches | Nudibranchs or sundial snails | Night flashlight hunt; dip again and quarantine if needed |
| Leather coral sticky or locally necrotic | Flow too low; film and detritus sitting | Add indirect flow; help the film away gently—do not tear |
| Green star coral or Xenia covering half the rock | Glued to the main framework on day one | Scrape or lift the rock; next time use a movable frag |
Three habits damage a tank more directly:
- Softies before the cycle is done: ammonia burns soft tissue as hard as it burns fish.
- Straight into the display with no checks: pest eggs hatch, and a zoa garden can go bald together.
- Bare hands on unknown zoas: treat them as possibly anemone-toxic—gloves, eye protection, wash before touching face or cuts.
Checking it in the studio
Magic Reefscape renders a full-tank composition: rock, soft-coral groups, and fish positions are in the picture. Whether alkalinity is steady, or pests came in, is not.
Set biotope and tank size first, then check whether softies sit mid-to-low and whether leather corals and fast spreaders have room. On the real tank, still follow the light, flow, and quarantine notes on this page.
Cycling goes back to reef cycling to first fish; species habits sit in the soft-coral entries of the Feedbook.
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2026-10-16