I don't have a trace of coralline growing on my totoka rock, not even a little bit of it. I also have a fiji rock that is full of it. So my guess is that some type of rock is not really compatible with coralline?

Anyway why worry that your reef is lacking something if your parameters are good and your coral are growing well? I too beleive that having coralline on liverock can impair its property to filter and block the deep pores.

You guys dont get the question. Maybe he wants the coralline. Some of us like it. I tried to help him and I dunno why it's not growing on his rocks. I'd like to know the answer to this as well. Had this question been about a weed like GSP or anthelia he would have had the answer right away. He has tonga rock and fiji rock. We have bought rock together and it grows great in my tank but not his. I put a rock from his tank in my display and refugium and both will be purple within a couple of weeks. And those are 5-10lb rocks.

I guess the simple answer is yes. You're missing whatever the other tanks have. Now a better questions is " Does it matter?"
If your tank is healthy, corals growing, measurable parameters are in check, then you don't need to go looking for problems. The answer to the part about doing something wrong is then "no"
If for some reason you really do want to have that stuff on your rock, there are supplements others have claimed work well.

What I would do then, is take the rock back to his tank, scrape off all the coralline and let the spores spread through the tank. That will often help seed the rest of the surfaces.

What everyone forgets is that coralline algae is an ALGAE. It needs what all algae needs plus it sucks up all your calcium, alk and Mg.

If you want coralline algae give it nutrients and light without competition and it will grow. You get darker reds and purples with lower or bluer light and the pale pinks and lavender with brighter yellower light

True!

Well i dont have many corals at all and im using reef crystals salt and my coraline growth is pretty good....
AND... up untill this post i thought this was a good thing....?
Thats what i was told to look for when buying my live rock so ive got a good 70% of it lol now what I have to start chisling it off???

lol! Like I said, it just something that I've come up with in my head, no proof at all, so don't go chiseling on my account :)
But, as Marie stated, it is algae, and creating an environment where it grows means other algae might grow well also.
Looking back, years ago my 150g had sheets upon sheets of this stuff growing everywhere. I also had very brown corals.
Current tank, not a lot of coralline, lots of coral color. Dunno, connected?

That's just their opinions. It's not bad. I run a calcium reactor and a kalk reactor, so in my case I'm not too worried about it stripping ca or mg from my tank. To each their own. I like it.

I personally like Coraline. The nicest tanks out there IMO are covered in it.

Coraline is not like hair algaes and what not and should not be bulked into the same category. Everyone has opinions and overall, Coraline is found on more premium rock than not. Coincidence? Probably not.

Good luck.

Don't let some opinions scare you. To each their own.