I've kept yoyo's before too and I never had a fin nipping issue. Now if it was a skunk loach or botia modesta then I'd worry a bit.
I haven't seen Robusta's for some time. I think you might be able to find them from one of those online sites that ship fish.
I haven't seen Robusta's for some time. I think you might be able to find them from one of those online sites that ship fish.