My Red Hot Blastomussa stays shrunken despite “good” parameters. What’s the usual culprit?

This species dislikes strong light and gusty flow. Aim for PAR 60–120 with a blue-heavy spectrum and gentle, indirect movement. Stabilize alkalinity (8–9 dKH) and keep moderate nutrients (NO3 5–15 ppm, PO4 0.03–0.1). Check for irritants like vermetid snails, sand abrasion, or nearby stingers. Feed small meaty foods at dusk. Improvement often appears within a week after reducing light and flow and restoring stability.

Why is the vibrant red fading or shifting toward brown/green?

Excess white light, very high PAR, and ultra-lean nutrients often wash out color. Shift to bluer lighting, keep PAR on the lower end, and avoid sudden photoperiod changes. Maintain moderate nutrients rather than chasing zeros. Ensure consistent trace replenishment via water changes. If recently imported, give time—colors often rebound after several weeks of stable conditions and gentle feeding with fine particulate foods or small mysis.

What placement minimizes damage from neighbors and sand irritation?

Seat it on a stable rock ledge or low shelf where polyps can inflate without rubbing edges. Provide a 2–3 inch buffer from euphyllia, favias, and other stingy LPS. Avoid high-flow sand beds that blast grains into tissue; if on sand, use a small tile or cup-like base to protect the rim. Gentle crossflow prevents detritus from settling without lifting sand onto the fleshy mantle.

Any feeding tips to boost growth without causing regurgitation or film?

Target feed after lights dim when feeder tentacles peek out. Pause pumps, use small pieces (minced mysis, enriched brine, pellets softened), and feed modest amounts once or twice weekly. Rinse frozen foods to reduce excess phosphates. Resume low flow after 10–15 minutes so food settles without blowing off. Overfeeding can trigger bacterial slime on tissue; if you see that, reduce portions and improve export.

Red Hot Blastomussa Coral

Blastomussa

Overview

Red Hot Blastomussa Coral shows fleshy, round polyps with bright red rims and contrasting centers. Blastomussa wellsi is a large-polyp stony coral that forms clustered heads; it prefers moderate lighting and gentle to moderate water flow. It is photosynthetic via symbiotic algae but benefits from occasional small meaty foods, which can improve growth and sustain coloration. Place it on the sand bed or isolated rock 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 1280–1350 ppm

Feeding photosynthetic, mysis shrimp, enriched brine shrimp, finely chopped marine meats, rotifers, copepods, zooplankton, microplankton, coral-specific powdered foods

Care & Placement

Red Hot Blastomussa Coral (Blastomussa wellsi) prefers low to moderate light (PAR ~60–120) and gentle, indirect flow; too much of either leads to bleaching or tissue recession. Place on the sandbed or low rockwork, slightly shaded from intense LEDs. Allow 2–3 inches of space; sweepers are short, but it can be stung by aggressive neighbors (e.g., Galaxea, some Euphyllia). Feed 1–3 times weekly with small meaty foods (mysis, finely chopped shrimp) or zooplankton powders; target feed at dusk with pumps off for 10–15 minutes. Maintain stable water: temperature 76–79°F, salinity 1.025–1.026, pH 8.1–8.4, alkalinity 8.0–9.5 dKH, calcium 400–450 ppm, magnesium 1280–1350 ppm, nitrate 2–10 ppm, phosphate 0.02–0.08 ppm. Monitor with reliable test kits, and avoid rapid changes—this coral is sensitive to swings, especially salinity and alkalinity.Acclimate with a 30–45 minute drip and temperature match; dip to remove pests, and light-acclimate using reduced photoperiod or screen over 1–2 weeks. Use a turkey baster occasionally to blow off detritus collected in the fleshy polyps. Signs of stress: paling/bleaching (excess light), gaping mouths or receding tissue (unstable alk or low nutrients), brown jelly (bacterial)—increase flow slightly, perform an iodine dip, and if needed frag away affected heads. Keep nutrients non-zero, avoid sharp rock edges that can cut tissue, and quarantine new corals to prevent pests and disease.

FAQ

Frequently Asked Questions

About the Red Hot Blastomussa Coral

My Red Hot Blastomussa stays shrunken despite “good” parameters. What’s the usual culprit?

This species dislikes strong light and gusty flow. Aim for PAR 60–120 with a blue-heavy spectrum and gentle, indirect movement. Stabilize alkalinity (8–9 dKH) and keep moderate nutrients (NO3 5–15 ppm, PO4 0.03–0.1). Check for irritants like vermetid snails, sand abrasion, or nearby stingers. Feed small meaty foods at dusk. Improvement often appears within a week after reducing light and flow and restoring stability.
Why is the vibrant red fading or shifting toward brown/green?

Excess white light, very high PAR, and ultra-lean nutrients often wash out color. Shift to bluer lighting, keep PAR on the lower end, and avoid sudden photoperiod changes. Maintain moderate nutrients rather than chasing zeros. Ensure consistent trace replenishment via water changes. If recently imported, give time—colors often rebound after several weeks of stable conditions and gentle feeding with fine particulate foods or small mysis.
What placement minimizes damage from neighbors and sand irritation?

Seat it on a stable rock ledge or low shelf where polyps can inflate without rubbing edges. Provide a 2–3 inch buffer from euphyllia, favias, and other stingy LPS. Avoid high-flow sand beds that blast grains into tissue; if on sand, use a small tile or cup-like base to protect the rim. Gentle crossflow prevents detritus from settling without lifting sand onto the fleshy mantle.
Any feeding tips to boost growth without causing regurgitation or film?

Target feed after lights dim when feeder tentacles peek out. Pause pumps, use small pieces (minced mysis, enriched brine, pellets softened), and feed modest amounts once or twice weekly. Rinse frozen foods to reduce excess phosphates. Resume low flow after 10–15 minutes so food settles without blowing off. Overfeeding can trigger bacterial slime on tissue; if you see that, reduce portions and improve export.