bn help

[stevie-o]

hey i have a birds nest frag that is developing an exposed skeleton at the base what could this be from sorry i dont have pics.
am,ni,na=0
calc=420
alk=8

 

[stevie-o]

anyone?

 

[iap]

How big is it? Flow?

 

[stevie-o]

its a 29g biocube hqi with 540gph from the power heads, and i don't know how much from the pump