Lighting: med-low but can be acclimated to high light.
Flow: indirect flow does best with med indirect flow, high flow will assist in it reaching out to sting other corals
It can sting fish but the sting is not enough to kill a healthy fish, it's not uncommon for clownfish to treat Euphyllia like anemones.
Hammers can be kept with like species but will fight with other corals.