I am an experienced keeper and breeder of aquarium fish and cichlids such as oscars and jack dempsys etc... however I have been away from the hobby for about 10 years. my plan is to setup a 75 gallon tank which i just purchased and in the future will setup a 180 gallon tank. I now have a fascination with rays however i fear that my 75 gallon tank will not be large enough for 1 let alone two rays, i am assuming the 180 gallon will be better suited for that. can anyone give me advice on what kind of ray will be able to be kept in a 75 gallon? can i get baby motoros and put in there or is there a ray that doesnt get that big that will be more suitable for a smaller tank? also if anyone can let me know of any additional or special challenges with rays that would be helpful. Seems the motoros are hardy but grow rather large and quickly, I would like maybe to get a pair, maybe put one in the 75 g and the other in the 180 but im thinking that wont be possible. Any help would be appreciated. Thanks in advance