So I have had my 5 gal tank set up and cycling for about 6 weeks now and during this time when I do 50% water changes it i do it by stirring up the gravel and cupping out the yucky water. Is this effective? Is a gravel vacuum necessary? I know y'all will say they are cheap and I know they are but I'm trying to save every expense I can. That said I don't want to harm my betta, I want the best life possible for him. Is stir and dip really that bad for your tank?