i use fox farms "grow big" for veg and "tiger bloom" for flowering. I also have used from beginning to end 1/4 tsp of superthrive in every gallon I have fed and they loved it. You can find fox farms at your local hydro store and is arguably one of the best brands you can go with. Also , in case you do not have it yet. A must must must for a successful grow will need to but the general hydrponics ph system with drops for testing your water/nute ph with ph+ and ph- solutions. you need the oh you feed your plants with to be roughly around 6.5 ph and this will indeed prevent a lot of problems in the future of your growth.
Do use the grow nutes during veg stage and use them during your first week of flowering as it isn't a complete shock to your plants to go through light shock and nute shock at the same time after your first week of flowering then begin the flowering nutes. Yes flush before your last two weeks of flowering and you should be good to go... anymore questions just ask...
Hope this helps