Hi,
How big are your fish? A good suggestion is to feed an amount that they will eat in a couple of minutes. Any leftover food will rot and pollute the tank. Once a day is fine but you could feed them twice a day and give a bit less at each feeding.
Overfeeding can raise the nitrates too high and that is not good.
Many of us here feed our fish sinking pellets since they can gulp air eating floating food. And it can caused a floating problem--swim bladder disorder.
I think that Wardley is a good brand of food. But I feed my goldies ProGold which are sinking pellets.