Never delt with either online at all. But I have been to both stores and not to put any store down or anything, I found that aquascapeonline delt primarily with piranhas. Nothing wrong with that in the least, I found their cichlid stock just ordinary and common. However shark aquarium had a vast selection of everything including piranhas, but they also had more of everything else of all sizes. I knew I would walk out with something when I saw a huge selection of Hoplarchus psittacus of all sizes where as in other lfs you'll be lucky to find 1 and probably already 8 inches for $150. I will be picking 1 on in the very near future at $30 for a 3-4 incher.Reptilesfishbirdsmammals;4338557; said:im not techincally sexing im just gonna guess male but sharkaquarium is awesome and all but there online store isnt great aquascapeonline is better imo..but its a nice fish!