Just tried it and not too impressed so far...of course I tried breaking it up some in smaller pieces to be easier for the fish to eat and it made a mess of the water with all the tiny specks floating around...... I may just leave it whole and drop it in for my cories from time to time.
Mine arrived yesterday - I dropped them in whole and they sank and my loaches and cats ate them with their veggie discs and shrimp pellets... free food is free food.