LFS's swear by everything in their store. My general rule of thumb is if they use it in their systems (make them put some in their show tanks as you sit and watch!!), then it is good enough for me - if I find value in it of course. My skimmer is hell on wheels and will take out most things I out in there. But hopefully the fish will consume the food before the skimmer does. They're pigs, they'll get it.