consider thawing in salt water vs fresh. weird thing but it seems thawing in fresh water makes em mushy and maybe a lil more buoyant. Do a side by side, its not that big of deal thoI use the cheap condiment squeeze bottles from walmart. I dump in about 6 different cubes and some rods or other food. I freeze 6-8 bottles, just cubes. When I need one, I add ato water and let it thaw. I used to just squirt in what I needed for that feeding (a bottle lasts apporx. 2 days). Lately, I've been pouring out 2/3's of water--straining it for the small foods that sort of float. Then add more ato water so I'm taking some of the po4 out as I feed heavily 2x's a day. The strained bits go in.
Note: I used to thaw but that many cubes, it was hard to get the food all back into the squeeze container. Too much trouble. And what I've researched said don't bother