I've got frozen cubes of bloodworms and also brine shrimp. If I put them in the tank frozen or partially frozen, they float and then will sink as they thaw. Sometimes axolotl gets a little aggressive and will go to eat them while they are still fairly frozen. I am wondering if this poses any harm to the axolotl, to eat the frozen cube, or if I should really let them thaw first. The thing I do like about putting them in while they are frozen is that they stay all together and will fall to the floor in one cohesive clump, making it a less messy endeavor. But I don't want to hurt my axie if the frozen food is going to harm him in any way.