I have 6 rummy nose tetras in a 40 litre tank but they are too active for the tank so I have moved them to my old 110 litre fish tank which is much better for them but I want to find either a small species of tetra, rasbora or barb that can go in the tank which are less active which would mean they are more suited to the tank. The tank also has 2 kribensis in and if there are no other fish in the tank they fight with each other which is why I need some other fish in there. The tank is longer than it is higher any suggestions would be welcome especially for the rasbora as only ever had harlequin and galaxy rasbora. Thanks