My Cracker Jack Blastomussa polyps inflate at night but stay shrunken midday—what’s the usual cause?

Blastomussa wellsi often deflates under excess light or direct, turbulent flow. Aim for low–moderate PAR (60–120) with gentle, indirect current. Check stability: swings in alkalinity, temperature, or salinity cause midday sulking. Inspect for irritants like vermetid snails or sand grains trapped under tissue. Maintain moderate nutrients (nitrate 5–15 ppm, phosphate 0.03–0.1 ppm). Gradual light acclimation and a slight shade overhang typically restore daytime inflation.

How can I keep the “Cracker Jack” reds and oranges from washing out or browning?

Color depth tracks spectrum, PAR, and nutrients. Use a blue-leaning spectrum (14–20K) and avoid PAR above ~150. Too “clean” systems pale this coral; too “dirty” leads to browning. Target moderate nutrients and stable alkalinity (7.5–8.5 dKH). Trace balance matters—large, frequent carbon dosing or heavy GFO can strip color. Slow any filtration changes and monitor weekly; subtle shifts show in the rim and oral disk first.

What’s the best way to feed this coral without causing tissue recession or fouling?

Feed after lights dim, when feeding tentacles extend. Offer small meaty fare (mysis, reef roe, finely chopped clam) once or twice weekly. Turn off pumps 10–15 minutes, and deliver small portions to each head; large chunks can tear tissue or sit and rot. Rinse oily foods. Resume gentle flow to clear leftovers. Consistent, modest feedings improve polyp expansion and growth without spiking nutrients.

Mine recedes when near other LPS, yet it has short sweepers—why the setback?

B. wellsi is easily irritated by chemical and physical aggression despite modest sweepers. Keep distance from Euphyllia, Favids, Chalices, and aggressive mushrooms. Avoid direct contact with zoas or encrusters that can overgrow the base. Provide space from rock edges that chafe inflated tissue. If housed on sand, keep detritus off the rim with gentle crossflow, and remove vermetids or bristleworms that provoke chronic retraction.

Cracker Jack Blastomussa Coral

Blastomussa

Overview

Cracker Jack Blastomussa Coral shows round, fleshy polyps with contrasting ringed mouths. Blastomussa wellsi is a large-polyp stony coral forming clustered heads; it prefers moderate light and low to moderate, gentle flow. It is photosynthetic via symbiotic algae but benefits from occasional small meaty feedings, which can support faster growth and maintain color. Place on stable rock or sand with space around it, as sweeper tentacles can sting nearby corals.

Quick Facts

Care Moderate

Lighting Low–Moderate

Flow Low–Moderate

Placement Low–Mid

Temperament Peaceful (2–3 inches spacing)

Recommended Parameters

Temp 76–80°F

pH 8.1–8.4

Salinity 1.025–1.026

Calcium 400–450 ppm

AlkAlkalinity 8–10 dKH

Magnesium 1250–1350 ppm

Feeding photosynthetic, mysis shrimp, enriched brine shrimp, finely chopped krill or clam, zooplankton/copepods, microplankton, coral-specific powdered foods, marine snow

Care & Placement

Cracker Jack Blastomussa Coral (Blastomussa wellsi) prefers stable, low-stress conditions. Place frags low to mid in the tank with low to moderate light (PAR ~50–100); too much light leads to bleaching and tissue recession. Provide gentle, indirect flow—enough to keep detritus from settling in the fleshy heads but not strong enough to whip polyps. Target feed 1–2 times weekly with small meaty foods (mysis, brine, finely chopped seafood) or a fine coral food; briefly pause pumps during feeding and resume after 10–15 minutes. Maintain temperature 76–80°F, salinity 1.024–1.026, pH 8.1–8.4, alkalinity 8.0–9.5 dKH, calcium 400–450 ppm, magnesium 1250–1350 ppm, nitrate 2–10 ppm, phosphate 0.02–0.08 ppm. This species is sensitive to rapid changes, especially in light and alkalinity—test weekly and adjust slowly.Set colonies on stable rock or rubble with 3–4 inches clearance from aggressive corals (Euphyllia, Favia, Galaxea). Blastomussa is generally peaceful with short sweepers but can be stung easily. Acclimate with a slow drip and light acclimation (shade or screen for 1–2 weeks). Dip new pieces to limit pests, and avoid physical damage to the fleshy tissue. Common issues: pale/bleached heads (reduce light, check nutrients), slow recession from high flow or low alkalinity (dial back flow, stabilize dKH), and brown jelly after injury (isolate, perform an antiseptic dip, improve flow and cleanliness). Consistent, moderate conditions yield steady polyp expansion and growth.

FAQ

Frequently Asked Questions

About the Cracker Jack Blastomussa Coral

My Cracker Jack Blastomussa polyps inflate at night but stay shrunken midday—what’s the usual cause?

Blastomussa wellsi often deflates under excess light or direct, turbulent flow. Aim for low–moderate PAR (60–120) with gentle, indirect current. Check stability: swings in alkalinity, temperature, or salinity cause midday sulking. Inspect for irritants like vermetid snails or sand grains trapped under tissue. Maintain moderate nutrients (nitrate 5–15 ppm, phosphate 0.03–0.1 ppm). Gradual light acclimation and a slight shade overhang typically restore daytime inflation.
How can I keep the “Cracker Jack” reds and oranges from washing out or browning?

Color depth tracks spectrum, PAR, and nutrients. Use a blue-leaning spectrum (14–20K) and avoid PAR above ~150. Too “clean” systems pale this coral; too “dirty” leads to browning. Target moderate nutrients and stable alkalinity (7.5–8.5 dKH). Trace balance matters—large, frequent carbon dosing or heavy GFO can strip color. Slow any filtration changes and monitor weekly; subtle shifts show in the rim and oral disk first.
What’s the best way to feed this coral without causing tissue recession or fouling?

Feed after lights dim, when feeding tentacles extend. Offer small meaty fare (mysis, reef roe, finely chopped clam) once or twice weekly. Turn off pumps 10–15 minutes, and deliver small portions to each head; large chunks can tear tissue or sit and rot. Rinse oily foods. Resume gentle flow to clear leftovers. Consistent, modest feedings improve polyp expansion and growth without spiking nutrients.
Mine recedes when near other LPS, yet it has short sweepers—why the setback?

B. wellsi is easily irritated by chemical and physical aggression despite modest sweepers. Keep distance from Euphyllia, Favids, Chalices, and aggressive mushrooms. Avoid direct contact with zoas or encrusters that can overgrow the base. Provide space from rock edges that chafe inflated tissue. If housed on sand, keep detritus off the rim with gentle crossflow, and remove vermetids or bristleworms that provoke chronic retraction.

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