Hi, I have a fully cycled 25 litre aquarium with a single male betta in but have bought a 45 litre aquarium for him because I feel like he will benefit from more space, I have a stringray 5 filter in my 25 litre which is for up to 25 litre aquariums, I have a new filter with my new tank but was wondering if the old filter in my 25 litre would be adequite for the new 45 litre tank, I know you can use some of the media from the other filter but the sponges from the stringray is nothing like the sponges in the new filter so am not sure what to do, I am not planning on doing any more fish so he will still be on his own