Coralline algae so soon?

[Benga]

I think I have coralline algae in my tank already but I use IO Sea Salt not Reef Crystals so my calcium levels aren't really that high or anything. The tank is also still pretty new with only 4 months on it and 1 month with live stock. I also used Dry Rock and Dry Sand too so the only coralline came from snail shells.

This makes me doubt that it's coralline but it's pink and doesn't brush off with a tooth brush.
I'm also getting a bright neon green algae concurrent with the pink algae.

Thoughts from the images?

Calcium: 340
Nitrate: 0 ppm
Phosphate: <0.25 ppm
Ammonia: 0 ppm

Also how's the Ricordea look? I believe it's a Ricordea Florida right?

 

[Tahoe61]

Looks and sounds like coralline. I have had it begin really early as well. Currently I have a 5 month old tank with a lot of coralline on the back wall, no dosing and regular water changes with PC lighting. It's been my experience that coralline grows faster under lower lighting.

 

[Big G]

Looks great so far. Nice Recordea. Looks right at home!

 

[Benga]

Looks and sounds like coralline. I have had it begin really early as well. Currently I have a 5 month old tank with a lot of coralline on the back wall, no dosing and regular water changes with PC lighting. It's been my experience that coralline grows faster under lower lighting.

Interesting I thought it would have taken much longer with all the dry rock and sand. This is a relief to hear though I for sure thought it was some bad algae I didn't know about