no i did not use the search function alothough i have been looking around for answers.

I've got 5 plants growing in a trough abt 4 feet long and 1 foot wide, with a cool white flouro hanging above them about 1 1/2 inch to 2 inches from the tops, im using Scotts potting soil with osmocote slow release plant food. my plants were doing very good until the day i spoke of they stopped growing at all. the biggest turned dark green, one looks like all the leaves are drooping and it's dying, is there anything i can do to save these plants?