I made my sourdough starter (made from whole wheat flour) 4 days ago and the first 2 days everything was going well. The sourdough started bubbling and it doubled its size. I was feeding it once a day with 1/4 cup whole wheat flour and 2 tbs of water. But yesterday when i checked it out, I saw some yellow liquid on the surface and it had a strange smell. I removed the liquid and some of the sourdough and kept feeding it twice a day now but with less water. Here is a picture of how it looks now but I dont know if it went bad. What should i do? Do I should keep feeding it twice a day or just once? Do I throw it away? I dont know if it was the feeding or the type of flour i used... i would really appreciate some help with your comments. Thanks!