Coraline algae colors depend mostly on the light in your tank. Along with many trace elements and the use of Mg
. The less light you have, lower in your tank the LR
is, or in a shaded area will produce the dark purple coraline. When you add more light, it gets lighter purple, and then even pink; as in my case.
It also depends on what color you have to start with. There are way too many contributing factors involved in the colors of coraline, but those are some of the main ones.
If a rock is completely encrusted in coraline, that makes it extremely hard (almost impossible)for green algae to grow on it. It may just be changing colors.
Excellent answer in the above post.
29gal BB | 42+ lbs LR
| 143watts PC
| Asst. Leathers, Frogspawn, Hammer, XLG Open Brain, Zoanthids, Mushrooms, Diploastrea heliopora | Blue Mandarin | Atrosalarias Fuscus | Pair Captive Bred Ocellaris Clowns | Peppermint Shrimp | 6 Astrea's |