| Rank | Board name and description | Posts | Members |
| 1 | Reef Central Fish and Aquarium message boards | 15639505 | 226124 |
| 2 | Saltwaterfish Tropical fish forums | 3091482 | 50955 |
| 3 | Dr Pez Fish and aquarium forums (in Spanish) | 2585897 | 63903 |
| 4 | Fish Forums Tropical Fish message boards | 2559485 | 46841 |
| 5 | Piranha Fury Piranha discussion forums | 2259789 | 37736 |
| 6 | Fish Profiles Fish and aquarium discussion forum | 930384 | 15482 |
| 7 | Aquarium Advice Aquarium and fish forums | 843828 | 15606 |
| 8 | Reef Sanctuary Fish and aquarium forum | 772263 | 28676 |
| 9 | Michigan Reefers Fish tank and aquarium discussion forums | 762071 | 9834 |
| 10 | Oscar Fish ifshkeeping forum specialized in Oscars | 691168 | 10517 |
| 11 | Cichlid Forum Message board dedicated to cichlid fish | 339211 | 55334 |