Common name: Green Algae

Ulvophyceae, commonly known as green algae, are a class of marine and freshwater algae that include many species commonly found in reef aquariums. They are photosynthetic and range from unicellular forms like Chlorella to multicellular forms such as Ulva, also known as sea lettuce. While some green algae are beneficial in small quantities, providing oxygen and removing nitrates, they can become problematic if they overgrow, competing with corals for light and nutrients. Hobbyists often manage their growth through controlled lighting, nutrient management, and grazing by herbivorous fish and invertebrates.

1. 
   Common name: Mermaid's Wine Glass

   Scientific name: Acetabularia crenulata
2. 
   Common name: Green Felt Algae

   Scientific name: Avrainvillea nigricans
3. Common name: Boodlea composita

   Scientific name: Boodlea composita
4. 
   Common name: hen pen

   Scientific name: Bryopsis plumosa
5. Common name: Caulerpa brachypus

   Scientific name: Caulerpa brachypus
6. Common name: Fern Caulerpa

   Scientific name: Caulerpa chemnitzia
7. Common name: Caulerpa floridana

   Scientific name: Caulerpa floridana
8. 
   Common name: Mexican Caulerpa

   Scientific name: Caulerpa mexicana
9. Common name: Caulerpa nummularia

   Scientific name: Caulerpa nummularia
10. Common name: Caulerpa Paspaloides

    Scientific name: Caulerpa paspaloides
11. 
    Common name: Leafy caulerpa

    Scientific name: Caulerpa prolifera
12. Common name: Razor Caulerpa

    Scientific name: Caulerpa scalpelliformis
13. 
    Common name: Sawblade Caulerpa

    Scientific name: Caulerpa serrulata
14. 
    Common name: Feather Algae

    Scientific name: Caulerpa sertularioides
15. 
    Common name: Killer alga

    Scientific name: Caulerpa taxifolia
16. 
    Common name: Chaeto

    Scientific name: Chaetomorpha aerea
17. 
    Common name: Spaghetti algae

    Scientific name: Chaetomorpha linum
18. 
    Common name: Turtle Weed

    Scientific name: Chlorodesmis fastigiata
19. 
    Common name: Green Hair Algae

    Scientific name: Cladophora herpestica
20. 
    Common name: Green Hair Algae

    Scientific name: Cladophora prolifera
21. 
    Common name: rock-weed

    Scientific name: Cladophora rupestris
22. 
    Common name: Velvet Horn

    Scientific name: Codium adhaerens
23. Common name: Codium arabicum

    Scientific name: Codium arabicum
24. 
    Common name: Green Fleece Algae

    Scientific name: Codium decorticatum
25. 
    Common name: Green Felt Algae

    Scientific name: Codium edule
26. 
    Common name: felt-alga

    Scientific name: Codium fragile
27. 
    Common name: Green Felt Algae

    Scientific name: Codium intertextum
28. 
    Common name: Green Felt Algae

    Scientific name: Codium vermilara
29. Common name: Derbesia

    Scientific name: Derbesia marina
30. 
    Common name: Green Bubble Algae

    Scientific name: Dictyosphaeria cavernosa
31. 
    Common name: Green Fern Algae

    Scientific name: Flabellia petiolata
32. Common name: Halimeda copiosa

    Scientific name: Halimeda copiosa
33. 
    Common name: Halimeda Algae

    Scientific name: Halimeda discoidea
34. 
    Common name: Halimeda Plant

    Scientific name: Halimeda incrassata
35. Common name: Large leaf coralline algae

    Scientific name: Halimeda macroloba
36. Common name: Halimeda Micronesica

    Scientific name: Halimeda micronesica
37. 
    Common name: Halimeda opuntia

    Scientific name: Halimeda opuntia
38. 
    Common name: Calcareous Green Seaweed

    Scientific name: Halimeda tuna
39. 
    Common name: Green Cactus Algae

    Scientific name: Neomeris annulata
40. Common name: Parvocaulis parvulus

    Scientific name: Parvocaulis parvulus
41. 
    Common name: Shaving Brush Alga

    Scientific name: Penicillus capitatus
42. 
    Common name: Mermaid's Wine Glass

    Scientific name: Penicillus dumetosus
43. Common name: Phoenix Worm Snail

    Scientific name: Rhipocephalus phoenix
44. 
    Common name: Mermaid's Fan

    Scientific name: Udotea flabellum
45. 
    Common name: Mermaid's Fan

    Scientific name: Udotea spinulosa
46. 
    Common name: Gutweed

    Scientific name: Ulva intestinalis
47. 
    Common name: Green Laver

    Scientific name: Ulva lactuca
48. 
    Common name: Sea Lettuce

    Scientific name: Ulva linza
49. 
    Common name: Sea Lettuce

    Scientific name: Ulva prolifera
50. 
    Common name: Sea Lettuce

    Scientific name: Ulva rigida
51. 
    Common name: Bubble Algae

    Scientific name: Valonia macrophysa
52. 
    Common name: Bubble Algae

    Scientific name: Valonia utricularis
53. 
    Common name: Bubble Algae

    Scientific name: Valoniopsis pachynema
54. 
    Common name: Sailor's Eyeball

    Scientific name: Ventricaria ventricosa