These little guys are giving me trouble. :;dk They're fighting now. I don't know why. After they cannibalized the one gourami, the other one smartened up and has gone into hiding (I think he's going to starve). Now the danios are fighting incessantly. There are four of them, and I read that they're happiest in groups of six or more. Is it possible that picking up two more would make them happier? I'm going to take the pleco to be rehomed in January. Would the six danios be too much in a 10 gallon? Should I take the remaining gourami back - I'm afraid he's lonely. On the plus side, I think my tank is fully cycled now. ETA: Totally unrelated, but I didn't want to start another thread. Are there any fish that prefer to swim vertically over horizontally (in a cylinder rather than a rectangle)?