As long as one isn't out competeing the other for food. I kept a 6in retic in with a 9in and 12in motoro pair. She did fine in there, I just had to make sure she got enough to eat.
Shouldn't really have a problem then. Also if you get a motoro smaller than your retic, the size of your retic should make of for the agressive eating habbits of motoros, cause they are very greedy eaters.
i am thinking of making a pond can i make it out of an old metal beer can it holds like 80 or 90 gallons of water it is in a shape of an oval and all i would need to do is plumb a filter into it and put a pond liner in it would that be alright for a couple of rays? im trying to think of an inexpensive way instead of buying a new aquarium
Doesn't sound like the best idea to me, just don't like the fact that it is metal and the chances of it rusting out. Also a ray will need something much larger than that for long term.
If you wan't something inexpensive go with a 300gl rubbermaid tub. That would be really good for a couple rays and I may do one of those as well. They average anywhere from $146 to a little over $200. They are very durable and you can cut into them easy and you don't need a liner.
I think its pearl of paradise that makes pond prefab ponds. They are not too expensive i think under $200. PM Michael for details because he just set one up and its awesome.