Glass sucker not sticking well??

[jackalcleo]

Just got an used Seio820 and the 4 black glass suckers just not seem to be sticking well to the glass surface. The top 2 sucker just keep falling off and blow onto the sand bed.

Any suggestions or change new ones

Wonder LCK 110 have sell these suckers or not?????

[Clownfish]

check ur glass, any coralline algae will make the suckers not stick

[jackalcleo]

Have already wipe clean the glass but still happen. The black seems to be a bit stiff to me though.