In the meantime while you make your mind up, why not get an Eheim Auto Feeder. 25 quid and you can't go wrong with Eheim. https://www.amazon.co.uk/dp/B0002AQY8A/I still cant make my mind up if I want apex or not but if I did I would definitely get the auto feeder.
And if you are worried about pellets/flakes floating on the surface and then disappearing down the weir, get an Eheim Feeding Station. The Auto Feeder sits on the top of the feeding station (the flat black bit) and the food drops down into the clear box. It then drops down into the tank and practically nothing gets washed into the weir as the fish get to it first ! Total cost about 40 quid for the pair!
PS - I do not work for Eheim nor am I on commission