I use the Omega wafers & have used another brand (can't remember what) but they don't "melt" quickly. They will fall apart the more they soak & get picked on. I try to drop them in the same location each time because there will be a mess in that spot from the small pieces that sink. When you say "melts quickly" what time frame are you talking about? I have 2 10g tanks & a 46g & have never had cloudy water from the wafers. How many do you drop & how often? My Mystery snails & CAE's love zucchini, cucumber & occasionally kale. Do you blanch it 1st?