My first tank I wanted coralline algae sooo bad and I bought a piece of live rock with lots of it scraped a bunch of it of in my tank shut of filtration for a good 10 minutes with the powerheads on. Sure enough a week or two later I seen it growing on all my live rock which made me very happy until I had to battle it every week scraping it off the glass :mad:
My current 40 gallon breeder (second tank) I never seeded the tank with coralline algae and no more scraping it off the glass, Thank god. It does look very nice on the rock work but a pain to scrape off to glass which I had to use a home made razor blade scraper. Not trying to discourage you just letting you know it's a pain to scrape off the glass.