Join Date: Oct 2010
Location: New England, USA
If you have catfish and loaches, you'll want the tank to have a sandy bottom, with very fine particles. The loaches sift the sand through their gills, and both the loaches and catfish have barbels - projections around their mouth they use to find their food. Their barbels can be damaged in other substrate.
As oldfishlady reminded me, loaches are as social as catfish and should also be kept in a group.
My female VT betta, Baby Blue, is extremely aggressive and killed a catfish I introduced into her tank. She found them to be too active, and chased and flared at them. She is in QT right now and the cats and loach are waiting to move into a 20H once it's cycled.
In a ten gallon, there is room for the catfish and betta... and if your betta is not a manic like mine is, you should be fine. :)
20H: 2 Cory Catfish, One very mellow Cambodian female Betta, Two Golden Veil Angelfish (male and female)