Rummynoses get pretty long though, about 2.5" or more. They also tend to prefer planted tanks, as far as I've read, as well as having more swimming space than a ten gallon can offer. I also think that you should stick to smaller fish which allows you to properly accomodate their schooling needs. Generally, a schooling fish really should be kept in groups of 6 or more, or it can induce stress which leads to disease. Harlequin rasboras, amber tetras, green eye rasboras (I think), neons, pygmy cories, etc are all better suited to such a small tank.