i found the crison comet ..what does it do? ..its one of the magic fish...does it cure sick fish?

You can see a list of the effects of each of the Magic Fish in this post, which is contained in the Spoilers thread of the Fish Tycoon Guides.

how are you able to edit my post? ..and why did you ?

I'm an administrator on the forum, and sometimes I edit the titles of posts so that others will know what the thread is about (which is what I did here). If everyone just puts "Help" in their title, or starts a new topic in an existing thread, the forum becomes a lot less useful.