ok, that's what I wanted to know. I never keep sucker fish with my rays. I know some people do but not for me. But wasn't sure how these cats acted. And being a ray tank, wanted to ask here instead of the cat threads...
Don't recommend it. Learned the hard way. I had five mature feather fins in my ray tank for about a week. Found them bothering my rays, and constantly sucking their slime coat. Took them out and put them in their own 75 gallon tank.