I have the same tank. I went with 8 Celestial Pearl Danios, 7 Pheonix Rasboras, 5 oto cats and 4 Fire Red Cherry Shrimp. The danios and rasboras school together and look beautiful but I would wait till your ammonia is zero, as they are delicate. The bad thing about a 25 gal is that you can have fewer fish than even a 20 long because of the low serface area, so I threw a small sponge filter in the left back corner for extra aeration at night. I run co2 during the day. The good part is that that sword will grow nicely because the tank is tall without being huge. I found that the stock t5's were not sufficient for all my plants, especially the DHG, so I use a couple clip on lights with compact cfl's and everything grows like mad. If you use micro species like I did, it makes the tank look bigger than it is, and you can have more variety. I put a pre filter over the HOB filter intake as well to prevent any fish or shrimp from getting sucked in.