The most members online in one day was 655, 01-11-2011.
Abner , aks72ca , andy , Anni , aquatic_expressions , AustinLear , axiotis , AzureColour , bbbrk , Borgstif , botb2 , Car2n , Ch1nzilla , charlie1 , cica , Cloud-Strife , Clydester88 , coldmantis , Coolie_don , coral/fish , CoralConnoisseur , coyote , daelie , Daney90 , Deviantaj , Dewy15 , DoubleEricG , ds71 , dubmaneh , Easyrider , edwinf , elbereth , ezdone , fatkinglet , fisherina , gaoya , gardenfish , Gehandylan , geonut , giermoivi , Gowyn , gtgwin , Guppymen , Hamish , Haus of Guppy , Havens , hendy8888 , homy77 , iamaloner , IMCL85 , infolific , JasonM , Jaysan , jen_jen_ng , jeprox , jfsjr17 , jimbogregs , joey 1967 , josephjojoc , jyd_me , kagt , Kajendra , Karin , Keith T , kem , koopie , lll , loonie , Lorano , Magzz , Malrek657 , marlonchow , martelvis , Mdk007 , merlin416 , Mississaugafish35 , mmatt , Mr crab , mtlreeffreak , n1ng , Nanoreefs , nfa1987 , Norman Hu , notclear , pak9927 , Papi , Parsana91 , Plecopecs , Poseidon , PPulcher , Ramez , Ranchu , rayjay , razputin88 , renesis , rmahabir , Rogerc , Rookie2013 , saltydawg , Sandman86 , ScarletFire , sector7 , simongan , siulongluiy , slobodan , Spicoli , Squeege84 , steve8855 , sujeev87 , tankies , tat2moe , Tenurepro , thaile601 , TOtrees , uniboob , united natures , univalreef , wchen9 , willijack , wishmeluck , yamala , YayAquarium , zairefronts