Frogspawn head fully dead, or half and receding! Help

[zach_jb69]

Had this frog for a while. Was 2 heads but now the right side blew up and is heading on 3 individual splits. Left side not so hot. Was splitting sorta and a few days ago I saw recession. Yesterday it looked like this and it’s stayed the same. Params:
JUST TESTED
Ammonia:0
Nitrite:0
Nitrates5-10 charts yellow differences are very very slight can’t tell.
Ca:390
Mag:1275
Ph:8

Skeleton has gha up to the top and both sides do. Idk if I acc damaged it while cleaning around it. But I hadn’t cleaned it for a month since this happened.

One month ago vs now.

 

[Science/G]

Calcium and magnesium are on the low side. What about alkalinity?

 

[zach_jb69]

Calcium and magnesium are on the low side. What about alkalinity?

I don’t have all tests but my pH has been around 8-8.5 so I assume alk is decent. The mag should be 1300. Not very far off. I also dose coralife liquid calcium to keep up. Was 400 last week.