Mixing Kenyi and demanosi?

rrcoolj

The species you have get very thick and large(around 8"). When I had my synodontis decrous in a 55 he was very aggressive toward other bottom dwellers. He ended up harrasing a bristelnose pleco to death. Unless you plan on upgrading to a 6 foot tank 1 catfish will be plenty for that tank. Since you are adding so many fish be sure to over filter.