Switching from HOB to sponge filters

I have a 5 gallon shrimp tank and a 10 gallon with a betta and some pygmy cories. They both have HOB filters and I'm considering switching to sponge. The flow is a bit much for my betta, even though there's lots of places for him to go out of the flow, I don't love that there's a part of the tank that he doesn't like. My shrimp tank filter works well but rattles and bugs me (i have a sponge over the intake). So for switching, is my best bet to set up the new filter and run both for a while? How long should I leave both in for? Any other words of wisdom?
 
If you've already decided to make the switch than my comment wont matter but one of the lesser discussed benefits of a HOB over a sponge filter is that with a sponge you really have no way of determining how much water is passing through the sponge. With a HOB you can see how much water is passing though it and when it needs cleaning. With a sponge its a guess. Oh and by the way if you have a sponge on the intake you get the benefit of having both a sponge filter and a HOB.
 
If you've already decided to make the switch than my comment wont matter but one of the lesser discussed benefits of a HOB over a sponge filter is that with a sponge you really have no way of determining how much water is passing through the sponge. With a HOB you can see how much water is passing though it and when it needs cleaning. With a sponge its a guess. Oh and by the way if you have a sponge on the intake you get the benefit of having both a sponge filter and a HOB.
I do have a sponge on the intake! It helps. I'm not set on changing, if there's a way to reduce flow (I've tried sponges on the output, not very helpful) then I'm happy to stay with hob.
 
I have a sponge filter in and running. I have a bunch of loose pieces of filter floss in the cartridge of my hob, could I hide it around the tank or tie it to the sponge filter to get the hob out quicker?
 
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