Foods To Feed After Constipation And Bloat

Hi
My betta has been suffering from bloat/ constipation . I'm now wondering what foods I should be feeding so it doesn't continue or reoccur. He was being fed omega one pellets which I wasn't pre soaking but will from now. I've also been giving him frozen daphnia to ease constipation.
What should I feed him now , is a combination of the above ok ?
Ally

Hi the pellets are very small until he slims down I was going to give two pellets morning and two at night , or I may do pellets in morning and daphnia at night .
I've literally had to retrain him to dive down to get the food . The daphnia sinks and so do soaked pellets . He so used to just sucking them from the surface , the food just fell to the bottom while he searched around the surface . It took a while for him to get it. I do a little at a time . It's tricky to measure the daphnia as it's just chipped off the block .
Ally