I have always been a big fan of euphyllia sp. corals. They are relatively easy to keep, are extremely colorful and can grow quickly under the right conditions. The way their tentacles sway in the water is also quite mesmerizing.
Another great characteristic is that you can keep euphyllia sp. corals in proximity of each other without having to worry about them stinging or killing each other. Hammers, frogspawns, anchors and octospawns get along very nicely. Torch corals have stronger stinging tentacles and will require a bit of extra space.
With the latest trends in the hobby favoring chalices, zoanthids and limited-edition SPS corals, hobbyists often overlook these gorgeous euphyllia corals.
The positive side to this trend is you can usually purchase a large colony of brightly-colored frogspawn, torch or hammer coral for the same price as a tiny frag of a watermelon chalice or a single polyp of a named zoanthid/palythoa.
Green with brown tips or brown with green tips are the most typical colors and can usually be found at bargain-basement prices.
Some of the more exotic colors included neon green, orange, purple and gold will command higher but still very reasonable prices.
There are also numerous exotic morphs (such as the Gold Torch, Toxic Green Hammer, Bi-Color Frogspawn and the newly available Neon Orange Hammer) that are simply stunning!
Moderate light intensity and medium water flow will keep most euphyllia corals happy. They prefer indirect water current which can be achieved with propeller-style powerheads such as the Hydor Koralia or Tunze Stream.
A pH of 8.0-8.3, alkalinity of 8-12dKH, calcium of 400-450ppm and nitrate less than 10ppm is ideal.
Many will accept, and benefit from, weekly feedings of small pellets foods or morsels of small meaty seafood, such as mysis shrimp or brine shrimp.
In my personal tank, I have collected about 20 different species and morphs of Euphyllia sp. corals over the past year. I have found the branching-type euphyllia corals to be a bit easier to keep than the wall-type.
Additionally, branching euphyllia corals can be very easily fragged/trimmed by simply cutting off branches with a coral cutter. This collection has become a nice Euphyllia garden that is one of my favorite parts of the aquarium.