Hammer losing arms

[Jimmy James]

Hi,
My euphillia has recently been shedding some of its tentacles as in the picture. It is growing and during the lighting period really fills out but once or twice a week seems to shed one of its tips. any idea what's going on?

Cheers
Alk 7.2
Ca 440
Mg 1350
No3 5
Po4 0.03
125 litres

 

[Mical]

Alk appears to be low IMO. I try to keep mine in the 8.0 range

 

[Mr. Mojo Rising]

same answer as above, Alk should be 8