I'm moving my female betta into a 10 gallon tank. As of right now, it will only have 3-4 plants. With weekly water changes does it need a filter? This betta is moving tanks because she likes to swim near her filter system in the other and I feel like she gets tossled around and her fins are a bit tattered. Thank tank I use now is a five gallon top fin revival water fall (she likes to play with the waterfall part). This new tank does not have a built-in filter, so recommendations for filters if one is needed would also be great!