my phone broke so i cant ask my good friend for her advice on what to do... my tank is yellowish wich means i musta missed a water change and so i wanna clean it... i have removed all of fish but what now? do i take out all objects, gravel and clean em>? do i take the dirty water and dump it all or will i need some of it? help i dont wanna kill my fishies and if i need to put them back right quick let me know...