Best supplement fert for MG potting soil?

I was wondering if anyone knew of a good supplement fert for MG when the time release fert runs out, It usually happens around the third wk of flower when all the fan leaves turn yellow overnite. Any help would be greatly appreciated.

any nutes will work just fine.

This is good stuff: http://www.generalhydroponics.com/genhydro_US/floraseries.html

This General Hydroponics Flora series is good stuff

Ive got FF liquid nutes, GB,BB,TB just didnt know if they had the right NPK ratios.