For the next 6 months I need some fish in one of my tanks, just to keep the filter running and a bit of nitrate for the plants. I've currently got 2 otos and 1 endler in it, and was thinking of one of the above fish to go in with them (I was thinking about 4 of whatever fish I choose). I've never kept either, and both look very pretty. My main concerns with both are that the guppies will either attack or breed with the endler, or that the tenellus will attack the endler.