Need help with an ID on two algaes

[marc111]

I have a reef tank. These grew from the rock. South pacific rock circa tonga.

Brown kelp like algae seems to have "kelp" bladders and the piece in the picture is about 12 in long/tall

The other picture is not hard or brittle. Fairly dense growth form with iridescent blue to the "leaves".

Thanks for the help.
Mark

 

[FinzAquatics]

The blueish one looks like a type of dictoya.. Not sure on the first one..

 

[Phycophila]

Yes, the iridescent one is a Dictyota...might be D. humifusa but a lot of Dictyota species have that lovely color to them! The other is a variety of Sargassum. Cool