This is an established 7 month old 55 gallon planted tank. When initially stocked life was grand the first month or so but now the Barbs no longer swim unless they feed, they sit together in the same left corner of the tank and never come out. I've been reducing fish in the tank to get my stocking levels under 100% per AqAdvisor in hopes it would spur my Barbs to actually swim the tank, this is what I came up with: (1) Fresh Water River Asian Clam (3) Zebra Nerite Snail (2) Spotted Pictus Catfish (Pimelodus pictus) (1) Bulldog/Rubbernose Plecostomus (Chaetostoma milesi, L187b) (1) Clown Plecostomus (Peckoltia Vittata) (6) Columbian Blue/Red Fin Tetra (Hyphessobrycon columbianus) (2) Siamese Algae Eater Fish (Crossocheilus oblongus) (8) Tiger Barb (Puntius tetrazona) Prior I had 7 Tetra's and 3 Pictus Catfish When I had 7 Tetra's they chased and harassed the Barbs - at least one of the Tetra's was doing that. With only 6 Tetra's the Barbs are left alone. When I had 3 Pictus cats they didn't swim, one stayed on the left side of the tank, one in the middle of the tank and the 3rd on the right side of the tank, and they never crossed those boundaries. When I reduced them to 2 at least they come out of their 'spots' and swim a little more. Their behavior defies what I have read being a schooling fish. They act more territorial than anything else. So far no change in the Barbs behavior. Thoughts?