Acan help

[jwalraed]

Hoping some here can lend some advice. My Acan lord appears to be splitting and has what appear to be two spikes protruding from the split. Recently it has began to close up about 1 hours before the lights ramp down. I’ve tested all the water parameters and all are good. I’ve had this Acan for 6 months with no issue. Below are pictures

 

[blaxsun]

Can’t tell much from the images.