Nothing to exciting, 2 fancy goldfish, glow light tetra's, x rays tetra's,rummynose tetra's,harlequins, black neons,cherry barb, a pit bull plec, panda corys, in a 40gal, 27gal,12gal.
Your tank is too small for glass catfish. They are a shoaling fish and need to be in groups of 6+ Minimum suggested tank size is probably around 30gallons (30-36" tank).