Rays and pleco's work for some and not for others, you might have to give it a shot and if it doesn't work the pleco's gotta go. As for the aro's and pbass they worked fine with mine but had to sell them just because i had a hell of a time getting enough food to the bottom without those pigs eating it all first. last of all i wouldn't keep con's with my rays if i already saw them picking on the tails, it's only gonna get worse as they get size and start breeding. Just my .02 though..lol