Red unknown in the tank

[clownfish_forever]

Hi bro,

Anyone can help to ID this? I suspect is some form of algae...but not sure what...

This red fellow is weird because it appears under light. When light gets dim, it seems to disappear. I tried to brush it off but cannot totally remove, and it grows back super fast in the same day. And it only cover one part of one rock...so I doubt it is cynao... if you see the second photo, it looks almost polyp-like or leaf-like.

 

[dreamscape]

I have similar type of algae in my tank. Don't think it is cynao, reads abt this red algae in one of the forum. Must be transported into yr tank fr live rocks or coral. Once in yr tank, will be hard to remove. I tried brushing as well but it will come back v fast.

[dreamscape]

A more effective way for me is to apply hydrogen peroxide on the affected area. It actually slow down the spreading