| Rank | Board name and description | Posts | Members |
| 1 | Reef Central Fish and Aquarium message boards | 12446684 | 190359 |
| 2 | Aro Fanatics Arowana and other fish discussion forum | 2685032 | 23541 |
| 3 | Saltwaterfish Tropical fish forums | 2508010 | 44767 |
| 4 | Piranha Fury Piranha discussion forums | 2039444 | 27828 |
| 5 | Fish Forums Tropical Fish message boards | 1993135 | 34513 |
| 6 | Dr Pez Fish and aquarium forums (in Spanish) | 1914608 | 40643 |
| 7 | Fish Profiles Fish and aquarium discussion forum | 908552 | 14773 |
| 8 | Aquarium Advice Aquarium and fish forums | 843828 | 15606 |
| 9 | Cichlid Forum Message board dedicated to cichlid fish | 712015 | 44813 |
| 10 | Nano Reef Nano reefs and fish discussion board | 699685 | 18372 |
| 11 | Oscar Fish ifshkeeping forum specialized in Oscars | 691168 | 10517 |