Ulva is an intertidal species growing along the shoreline. it gets beat up by waves and exposed at low tide to tropical sun.
I've found it to be anything but delicate. i grow it outside in partial shade/sun. it does attach by holdfasts to the rock, glass, etc.
Gracilaria (ogo) I grow in the fishroom under cheapo HD standard flourescents (5K). this algae can collect detritus, etc, much like chaeto, and needs to be kept free of crud to thrive.
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