Why does my LPS do this every night?

[Miklo_Miklo12]

They form a lip every night

 

[fishguy242]

hi,kinda normal for lps to close during the night,sometimes open and close a couple of times during night..

 

[Miklo_Miklo12]

hi,kinda normal for lps to close during the night,sometimes open and close a couple of times during night..

It forms a lip though