Star polyp questions

[Bradsreeeftank]

I have a nice size star polyp colony, but recently its been kinda closed, there looks to be detrius on it but when i blow over it dosnt blow off easy. if i dip will it kill the algea? also if want star polyps to grow on back of tank what should i use for glue? i wanna be able to pull them of the back of glass if they dont do well there.

 

[cvysochin]

If it's detritus you'll need to get more flow on them. Also check your magnesium. I've noticed when they seemed to be closed for a while my mag was usually low. As for glue you can use the gel stuff. I use the gel glue from the dollar store with no I'll affect.