I will see how i go about it.. I will not put them in as pups, they have to grow abit first. I already know about the discus picking, but like with everything else i gues it all comes down to individuals. I have had discus with 5 rays before in a 180 gallon, with no problem. But i will definetley keep an eye up when the day comes. I think hystrix - discus will be a great combo if it works out.