Im not keen on cipro for euphyllia which it will likely stress the coral. There a few things to know when it comes to any euphyllia care. Lighting and water flow very important when it comes to recession and polyp bailout.
I asked about age of tank because hammer and euphyllia require STABLE conditions. New tanks are subject to swings. One of them is calcium. If low or unstable, rarely will euphyllia survive. Location also important. If lights too bright or too dim- they will suffer. Location as far as flow is also important. Too much flow will destroy them over time. The polyps should sway in the current, but not sustain so much pressure they are constantly bent over their skeleton. Too much flow will tear the polyps (worst case) and cause the polyps do not extend in the first place (best case). So, don’t give them too much flow.
Hammer is Not a starter coral and is a moderately challenging species to care for. The large and delicate polyps have a need for stable water parameters, moderate water flow, regular feedings, and the need to test for and maintain calcium levels above 400ppm which puts these great corals in the category of moderate care level.
I believe tank may not be mature enough to support these guys but now you have them and key will be to keep your numbers stable.
Recommended parameters are:
Temp 77-79
ph 8.1-8.3
salinity 1.025
nitrate < .10
phos < .04
Ammonia < .03
mG 1300
Alk 8-11
CA 400- 440