The feather/fern algae in picture#1 and seagrass like algae in picture#2 are known as bryopsis. You can get rid of it manually & siphon it away at the same time while the padina algae in picture one can be treated as decorative algae but quite challenging to maintain for it is classified as advanced level to keep. No idea with the algae showing at picture#3 since that's not clear enough. HTH
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