I know I'm out on the fringes here... but in buying many varieties of Hillstreams, I have a very large variance of sizes... so far, similar, & dis-similar are all getting along, but I have some that go 5 inches long, & others are only 3/4 of an inch at purchase... I'm really curious if all of these, if thriving, will reach at least similar sizes, or if the smaller ones, are a smaller variety, & may be as big as they get??? many of them are just listed like this... "Gastromyzon sp."... so they haven't been properly or fully identified, by the wholesaler, or on line seller... thoughts of a source for possible better identification, & species information???