Common name: Red Algae

Florideophyceae, commonly known as red algae, are a class of mostly marine algae notable for their reddish pigmentation, which is due to the presence of the pigment phycoerythrin. This class includes many species that are important in reef aquariums for their ability to perform photosynthesis and contribute to the biological filtration by absorbing nutrients. Some species can also provide a natural food source for various marine invertebrates and fish. However, care should be taken as some red algae can become invasive and may need to be controlled to prevent them from overgrowing other desirable inhabitants.

1. 
   Common name: Manila Grass

   Scientific name: Actinotrichia fragilis
2. 
   Common name: Cryptic Branching Coralline Algae

   Scientific name: Amphiroa cryptarthrodia
3. 
   Common name: Lime Green Algae

   Scientific name: Amphiroa fragilissima
4. 
   Common name: Red asparagus algae

   Scientific name: Asparagopsis taxiformis
5. Common name: Botryocladia botryoides

   Scientific name: Botryocladia botryoides
6. Common name: Botryocladia pseudodichotoma

   Scientific name: Botryocladia pseudodichotoma
7. Common name: Botryocladia Skottsbergii

   Scientific name: Botryocladia skottsbergii
8. 
   Common name: Grape Caulerpa

   Scientific name: Botryocladia uvaria
9. 
   Common name: Red Algae

   Scientific name: Centroceras clavulatum
10. 
    Common name: Mermaid's Wine Glass

    Scientific name: Dichotomaria apiculata
11. 
    Common name: Scroll Algae

    Scientific name: Dichotomaria marginata
12. 
    Common name: kanteen

    Scientific name: Gelidium corneum
13. 
    Common name: Gelidium Seaweed

    Scientific name: Gelidium microdon
14. 
    Common name: Dwarf Red Algae

    Scientific name: Gelidium pusillum
15. Common name: Spiny Gelidium

    Scientific name: Gelidium spinosum
16. 
    Common name: Gracilaria

    Scientific name: Gracilaria curtissiae
17. Common name: Warty gracilaria

    Scientific name: Gracilaria gracilis
18. 
    Common name: Red Algae

    Scientific name: Gracilaria parvispora
19. 
    Common name: Ogo

    Scientific name: Gracilaria salicornia
20. Common name: Gracilaria tikvahiae

    Scientific name: Gracilaria tikvahiae
21. 
    Common name: Red Sea Lettuce

    Scientific name: Halymenia duchassaingii
22. 
    Common name: Dragon's Tongue Algae

    Scientific name: Halymenia floresii
23. 
    Common name: Dragon's Tongue Algae

    Scientific name: Halymenia floridana
24. Common name: Hydrolithon boergesenii

    Scientific name: Hydrolithon boergesenii
25. 
    Common name: Dragon's Breath

    Scientific name: Hypnea musciformis
26. Common name: Hypnea Spinella

    Scientific name: Hypnea spinella
27. 
    Common name: Jania rubens

    Scientific name: Jania rubens
28. 
    Common name: An encrusting coralline alga

    Scientific name: Lithophyllum incrustans
29. 
    Common name: Coralline Algae

    Scientific name: Mesophyllum mesomorphum
30. 
    Common name: Red Ribbion Seaweed

    Scientific name: Nitophyllum punctatum
31. 
    Common name: Red Sea Lettuce

    Scientific name: Platoma gelatinosum
32. Common name: Polysiphonia elongata

    Scientific name: Polysiphonia elongata
33. 
    Common name: Red Grape Algae

    Scientific name: Rhodymenia holmesii
34. 
    Common name: Dulse

    Scientific name: Rhodymenia pseudopalmata
35. Common name: Scinaia complanata

    Scientific name: Scinaia complanata
36. 
    Common name: Red Algae

    Scientific name: Solieria robusta
37. 
    Common name: Red Mangrove

    Scientific name: Tricleocarpa cylindrica
38. 
    Common name: Blue Axil Chromis

    Scientific name: Wrangelia argus