I use ocean forest too. Yep your seedlings can go for 3-4 weeks with out any food. After a month I add a tbs of dried blood to the soil. every month(30 days) feed her. When she goes into flower I add triple phosphate and 1/2 the dry blood she was getting in veg. You can buy the dry blood and triple phosphate really cheap at your garden store. A bag of each will last you a long time, since you only need a little bit each month.
Simple, Cheap, and Easy.