I get a small cup and add room temperature RO
water. I then add the cube and let it sit for 5-10 minutes, until it dissolves. Then I take a measuring cup (small) and scoop out a small portion at a time and feed it to the fish. This allows for greater flexibility in portions fed at a time. You can wait until they eat it all and then pour in a little more if necessary. dont feed your fish a whole cube because 1. it may be too much food, and 2. you want it to be thawed, it is bad for the fish to eat frozen or partially frozen food. Good luck!