hi guys im new to the forums and this is my first post, i have been keeping marine fish for 4 years , im not sure how experienced that makes me in the hobby but im looking to start on elasmobranchs, i have only the 55g salt tank that i have been messing with since i started, im heading off to school in a year or 2 so i am unable to upgrade tank sizes, so im asking if a ray or a small cat shark is feasable in my situation or if my tank is too small and i should forget it until i can upgrade. as far as shark sizes i hear 180 is the minimum in gallons but i hear freshwater rays are good in 55 and was wondering if the same thing might apply in small species of marine rays. 
