I have a Tiger shovel nose and a marble cat with my 3 Motoro's and no one bugs each other. I have heard of big cats getting poked in the stomach from the spikes on rays tails.
tigrinus is a popular cat....I think the bagarius sp. are good too..... I have seen TSN and RTC with rays... main consern is feedings..... cats grow quicker and eat a lot more food...
yeah i use to have a pleco but my male stingray killed it... it actually stung it, it was quite a sight to see, I had never seen the pleco bug it but it must have been to see it act that way.