I have a ten gallon tank with a beta 5 cardinal tetras a clown loach, 3 hemigrammus and 1 siamensis. I am using an Aqueon medium filter with an Aqueon QuietFLow filter. Beta has been in the tank a year. All other fish were added a month ago and all has been good in the tank. When cleaning today we rinsed filter in tank water we had removed. When I put filter back in tank it spewed dirt throughout the tank. Think I should replace it but how do I do so and not remove good bacteria? Have had same filter since starting the tank.