Yeah nothing to worry about on the yellow and red front - red is coraline, you can get different colours and the yellow is probably a form of algae, I have both in my tank
The other white thing though, that is interesting, when you first said about it I thought, ah he has some sponges growing, but then I saw the photos and I'm now not sure but they look really interesting - sure someone will identify them
You have a yellow banded maroon fish................ahhhh I want one!!
i THINK i have that white stuff in my tank too.. mine look exactly the same as yours but alot smaller.. it is about 1mm wide and 1cm in length.. i asked people about it and they said its just growth from the rocks.. nothing to worry about..
of course.. mine could be something else but hope this helps..
this is an antler sponge..one of the Leucosolenia family....like most sponges it is a sign of a nice mature, clean system..
In the pics i see small colonies of aiptasia anemones starting..these can reach plague porportions, stinging and destroying your corals if not kept in check..