how can i increase my purple coraline algae???...i have this purple up chemical from carib sea....i use it somtimes but is there any other easier way to make the rocks purple??

Nope just time.

The most I did for it was when I saw a patch of it growing on the glass I went over it with a mag-float. Don't know if it did anything or not but yeah what First said....TIME

Dump the Purple Up. Go with a 2-part solution like Reef Code A/B (or B-ionic), keep your calcium levels where they should be, be patient, and voila!

Two part A and B solution kent marine. Coraline loves calcium

i use brightwell aquatics code a and code b every other day

If you don't have anything with coraline on it, seed your tank. Go to a LFS and buy a small piece of LR with lots of purple. Or if you have a local reefkeeper with alot of coraline, get'em to scrape some off the glass and throw it in your tank. Then just keep your calcium/alk on point with a 2-part like mentioned. The purple up junk was a waste of $.

Time with regular water changes to keep up your calcium.

If you don't have time, Krylon fusion makes a waterproof purple paint.

Drip kalk.

don't dose anything unless you're testing for it. test calcium and alk to see where your levels are (API makes a cheap kit). you want your alk around 9-10 and your calc around 450. then, like everyone says, give it a few months and it'll grow.