Is this Coralline?

[smarthawk]

Hi all! Tank is about 100 days old. Within the past couple days I’ve noticed these little dots on the back of my aquarium. There’s also a couple on the powerhead and a return nozzle. It doesn’t fluoresce but it’s a solid color and looks lightly pink. Can anyone help ID? Thanks!

 

[smarthawk]

Pics are crappy, but they are pale dots on the back of the display. There are some spots on rocks and some of snails are covered in coralline.

 

[MaxxuM]

If they are purple or pink, then yep. If you want it to grow keep your alkalinity above 8.4dKH balanced with calcium and keep the flow medium to high.

 

[Vette67]

If they are purple or pink, then yep. If you want it to grow keep your alkalinity above 8.4dKH balanced with calcium and keep the flow medium to high.

I’m wondering where you came up with that 8.4 number. That’s oddly specific. I keep my alk below 8 and grow more coralline than my urchins can eat. So I’m curious about where that number came from.

 

[MaxxuM]

I believe I read it on a paper years ago about calcareous algae growth potentials and by coincidence it's also what Red Sea recommends.

 

[smarthawk]

Thanks guys, it's pink and my dKH has been steady at 8.6 for at least 3 weeks now. Hopefully it keeps going.