I'm currently filtering my 'main' tank and I want to convert a bowl for a betta. I've bought a little sponge filter. Can I cycle this in the main tank at the same time? Would it work if I just took the sponge from the little filter and put it in the main tank filter?
Here's the setup
Where would be best to put the sponge?
Thanks
Here's the setup

Where would be best to put the sponge?
Thanks