i was wondering i have heard that a sponge filter is safer for a Betta fish. I have a 30G and i plan to have my Betta in a community tank but im wondering if a normal filter is good enough of if sponge is better for a situation like this.
Bettas prefer calm , still water. So yes make sure the currant isn't to strong. Also stay away from the air pumps. The bubbles can stress them out.
I have a sponge fit over my filter intake and sponge inserts on the filter exit to slow down the water flow. It works pretty well! Also, tall plants by the filter output will help diffuse the current. I'm using a melon sword for that purpose.