Area 51 chalice

Area 51 is a named chalice line in the Echinophyllia family, traded for the glow it throws under blue light — a deep green body with contrasting eyes and a rim that lights up at the growing edge. Colonies grow as an encrusting plate that follows whatever sits under them, cupping slightly as they mature and budding new eyes across the surface.

Keep it on the bottom. Medium light at sand-bed level suits this coral; push it higher in the tank and the green can wash pale, so acclimate any move upward over weeks. Flow should be low and indirect. Strong flow aimed at the rim lifts the thin tissue edge and stalls growth. Chalices reward stability more than any single number — hold alkalinity steady in the 8–10 dKH range and avoid big swings, because the growing rim is where swings show first.

Give it clearance on all sides. Like other chalices it extends sweeper tentacles after lights-out that can sting neighbors, and the sting is worse than the coral's calm daytime look suggests. A few inches of space is a fair starting point, with more as the plate spreads. It feeds at night as well: a small target feeding of fine meaty coral food or powdered coral food once or twice a week keeps the eyes plump and the rim advancing.

Growth is slow and deliberate, measured in new eyes and millimeters of rim rather than fast coverage. Once settled in one spot it tends to pick up pace, so frequent moving is the main thing that sets it back. Fragging means cutting through skeleton and tissue with a saw; healed frags skin back over the cut edge when kept low and shaded.

Field notes — what keepers report

- Chalice keepers consistently warn that the nighttime reach of an Echinophyllia is much longer than the daytime footprint. Keepers have traced mystery stings on nearby corals to sweeper tentacles found only on a lights-out check, and the shared advice is to scout the tank with a flashlight before judging a placement safe. Some keepers with isolated chalices report never seeing sweepers at all.

- Color reports split by lighting. Growers running blue-heavy schedules describe the eyes and rim glowing strongly, while keepers under whiter or brighter light describe the same line going flat and pale; moving frags lower and bluer is the fix most often reported to bring the glow back over a few weeks.

- Feeding reports lean positive: keepers who target-feed at night describe faster rim growth and new eyes appearing sooner, while keepers who never feed describe a coral that holds its size for long stretches without declining.