I dont have peruvian motoros I have columbian. Is there any difference between the two (growth)? I am very excited to get my pond, I think im going to try and get some marbles. The only problem is that I live in Canada and there arent alot of places to get good stingrays and ive never dealt with shipping any fish before (so i would prefer not to do it). I at the moment have a male columbian motoro and a sexed pair of retics. I will be selling the retics (If anyone is interested) and buying females (2). I already have talked to a guy near me who is keeping a motoro that hes had for a year (a female) in a 75 gallon tank. Im going to buy her off him (most likely, but ive never seen her so thats not a for sure thing bec she could be in bad shape) for $160. Which I think is a fair price because shes in her juvenile stage (as well as my male). Does anyone know of anywhere I could get a marble in my area for a reasonable price (ontario, canada) or in Michigan (bec im right along the border)?