Pulsing Xenia not .. pulsing ?

[OCDP]

Hello all,

This may be a dumb question but the past couple days I have noticed my frag of pulsing xenia is no longer pulsing.. I bought the frag Friday and it was pulsing soon after being put in the tank.

I am just curious as to why this happens? Does this mean there is something wrong in the tank? ... the xenia is still open and does not look unhealthy, just not pulsing

Also, it seems that it is often closed up... but nonetheless still looks healthy otherwise.. and I am pretty sure I am seeing new heads growing on it as well.

Thanks,
Scott