I am new to SWF but have had others in the past FW. I have been doing a lot of homework to get to know about SWF and how to care for them. I Have been to walk mart and as Meowzer Said unless it says Marine fish I would stay away. We have 4 walmarts in the area and 2 are super walmarts and they do not carry Marine Fish food. I would Suggest that you take the hour long trip to your LFS if you care about the health and life of your Fish. You can also buy Food for your fish online. The "Doctors" sell a Great Selection of Frozen Foods as well as Flake and Pellets that would be better Suited for your SWF if you dont want to Drive the Hour. Hope this helps and DO your Research and ask Questions it helps.