Do I NEED a filter on my 10 gallon tank? I have one, but have not used it in almost a week. When I did use it, it never sucked my betta up or "push" my betta around, but he hated it!! He'd hide and I would think he's sick. Now that the filter is off he swims around almost all day. Do I need to use the filter? I'm also trying to cycle the tank and I've gotten pretty much everything safe point on the API tests, except the ph, which I've managed to lower to 7.5. Would the filter help that at all? Also if I put a sponge in it to slow it down what do I need to do so the filter won't dump all the dead bad bacteria in my tank? Please help! I've written a question earlier this week and cannot see where it posted and no one has helped!