New stingray aquarium

I am soon to be getting a 6', 2', 2' tank.
It has already been ordered and i want to keep stingrays.

It will be my first time at keeping rays but ive done alot of research on them for the last 2-3 months and feel that keeping them should be okay.

The only problem i have is which stingray to keep.....
going in the tank as well is two 7-8 inch discus
4 medium wild angels
and a small dwarf shovelnose cat.

I was thinking about keeping retics as they stay relatively small but they would be wild ones and ive read that they can be quite fussy about what food they eat.

The only other ray that is in my price range that i can get hold of is a motoro. i have heard that these are usually the best rays for begginers but my only problem is that it would probably get too big.

Does anyone have any suggestions or ideas that would be useful?

cheers

where would people recommend getting a hystrix from?
I live in the Uk and my lfs cant get hold of any. Does anyone know of any good supplyers of hystix in the uk?


cheers

i think i will go for a motoro...... if so how many do people recommend for my tank.

I was thinking of just one male as they stay smaller?
Is this okay?

cheers