It can take anywhere from 5-10 days for most strains to recover from any shock or nutrient problem. Monitor your Ph and stabilize it before you feed them again. Most likely Ph was the first problem that causes the second problem.

Check the nutrient availability chart posted in the grow FAQ section. Follow that chart while you finish your grow to avoid problems again. The chart will show you the different minerals available to the plant at variable Ph levels through out your grow.