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Hi Laurent - no nitrites - great!!! That first pic - some type of red macroalgae but I'm not sure what kind. It looks kinda nice to me, but I don't know if it's a nuisance type or not. You might want to post the pic in the Marine Plants & Macroalgae forum to see if anyone can ID it & get you any information on it. My guess on the second pic is a type of ball sponge - I get them in several different colors like that - white, yellow, even almost black. I have a lot of different sponge types on the back side of my rock too. Most seem to prefer the dark, shady areas. If it is a sponge, and I think it is, sponges are fine to have - just filter feeders.
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