This is what my betta is currently in. I like it ok, but I just have a heater, no filter on it. Im cycling a 5g to upgrade him, but if I didnt have the room id be fine keeping him in the 2.5g.
I use cheap plastic cling wrap over the top rather than the glass cover. Im not sure how your filter would hook onto the tank, I know the one I have now wouldnt fit on it. I would have definite problems for with the second little ledge that the glass cover sits on.
Do check the seams though. When I was buying mine I noticed that some were a little sloppy. You can see the "glue" (i have no idea what they use exactly to hold it together) up by the top corners and some had big chunks.
Last edited by WhitneyLin; 11-28-2013 at 12:14 AM.