Just wondering if someone could explain the differences between these three products? Do you find if your fish likes one, it'll like the others? Reason I ask is I've got my aro and dats on the food sticks and I'm looking to get something for my bichirs as well. I would also like something sinking for my dats since they only eat the sticks if it gets in the filter stream and gets sent to the bottom of the tank. Thanks!