Mine eat anything and everything. They are especially fond of the doromin sticks that mange to get past my Cichlids. Just a thought Ellie could you run to buying maybe a couple more (if you have the tank space) ? as they are very social fish, much happier in a group.
love there food do clowns also heard an school theory on clown loaches is they are best kept in odd number groups like 3, 5, 7 for example. dont know why but it something I have now always done, I have 11 in my tank all different sizes and in larger groups they are much braver