anemones not attaching.

I have 4 small condy nems in my 29 long and 2 of them won't attach to the rock. the first one I got is doing great but 2 aren't. they are healthy and params are good. tank is 7 months old. I do have this algea I think on the rocks and sand. its a brown color and its really long and stringy in some spots. no bubbles like dinos have so I don't think its that. cyano mabe? its on the glass also. any ideas? thanks!





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