do you feed with an "inject TUbe"' I am in love with it. ITs a little medical tube "like a syringe" but the needle is plastic short and wider. fill it up with food. mix in some water by sucking it out of the tank. (carefull, fish used to this tube will feed directly from it so dont suck on the fish mouths!)
a light push from the tube and your dominant eaters will try and suck the food out the tube! its great!. then while they are busy, you can "shoot: the food directly to whoever is left out of feeding!. I learned this from watching the "pros"' feed corals.
With this little tube you can measure perfect everything from testing and everything else.