I think that it should be Ok too with five or six inches of seam above the water lining holding it together. I might see about some other kind of trim reinforcement too.
I have already settled with the S. petricola
--they're on their way
--but on PlanetCatfish.com
I ran into an interesting discussion starting with a questions about selections for a smaller tank.
http://www.planetcatfish.com/forum **catfish for 30g tank