i have a few questions about oxygen inside my 10 gal tank, i have a aquaclear 50 right now and the water level is alittle more then one finger below the rim. the filter gives off bubbles on the top of the surface but i dont know if its enuff, my tempaure is at around 78 degrees. this is a new tank and has not been cycled yet (2nd day) if two fish wasnt doing anything sitting on the gravel then i change 10% of the water and they swam around more, so just woundering if i have enuff oxgen inside my tank or do i have to but another air pump.