Ok there's some bad news. And some more bad news which I hadn't got to up to now. Your kissing gouramis will eventually reach about 10" each so will massively outgrow your tank and your catfish is a common plec which can reach 24" and you've got these in a 10 gallon tank. You have unfortunately had a one eyed, brainless, moronic, knuckle dragging, spotty faced numpty at Pets@home help you with your stocking. Stocking male and female bettas in the same tank is the most basic no no in the fish world, and they got that wrong

. Don't ever go there again, ever, ever, ever, ever! Those fish won't be able to turn around in your tank in a few years

. They will also grow quickly and will soon overwhelm your filter with the huge amounts of waste they are producing. This will lead to water quality issues and deaths amongst your fish as you have already experienced.
My advice would be to remove all your current stock and start again. It's the only solution unfortunately. Even the female bettas are a dodgy area. Bettas are not good community fish and more often than not will attack other fish or have their long flowing fins nipped to shreds by smaller inhabitants. The should only be kept in a single species tank.
All the fish I suggested earlier are fine as community fish HOWEVER, apart from the gouramis they all need a minimumgroup size of 5. This limits you to picking probably a maximum of 2 species and that's it. Want more variety? Then the only option is a bigger tank.
