Mini colony not doing well

[Hammer100]

I have a mini colony of JF Razzmatazz that was doing great and then about week ago all tips browned and now it has receded some around the base and has turned mostly green
Should I try to cut some frags out of it or see if it will make it?

 

[Nano man]

Pictures would help

 

[Hammer100]

 

[Kalibur2]

Looks like burnt tips. Alkaninty high with low nutrients some sort of alk swing. What are ur levels

 

[Nano man]

What changed until a week ago?
Lights, maintenance routine and how long have you had this colony in your tank?

 

[Hammer100]

About two weeks ago I set up my doser for dosing Ca and alk so I’m thinking that did it. I run between 7.6 and 7.8 on alk. I never saw it spike but I’m sure it prob happened.
I’ve had it for about 6 months and it was one of the fastest growers in my tank.