Can anyone recommend a decent sinking pellet suitable for South American dwarf cichlid that is available in the UK? I am currently using some small (around 1mm before going into the aquarium) "semi floating" granules which float for ages and end up getting lost in the gravel so am looking for something that sinks quickly and will be relatively large to allow for longer feeding and that will be easily visable in gravel. My Bolivians won't touch flakes as I expected they wouldn't. Thanks in advance.