Yeah, I assumed it wasn't cycled, that's why I suggested moving some aged gravel into it. Since they're that small, I don't think I'd net them, personally. I'd take a cup or plastic container (whatever you use for your fish... something not been washed with soap) and scoop them up with water and then submerge the container into the 2.5 and let them swim out. It's less stressful for them, and if you move then into their own tankwater, they'll hardly know they've been relocated. If you move some substrate and do frequent lil water changes, I wouldn't worry too much about the non-cycled tank with 7 new born fry. You'll need to change a couple of cups of water morning and night, though.