I'm using the Bio - Bizz 3 part solution and finding at working perfect,
The browning on your leaves could be from many a things but if your not feeding it could be from lack of nutrients in the soil ,
Post some pics for the guys on here to have a look.
Not just Hydro nutes dude, i use it for my soil with a bio - bizz soil mix, works calss look at my grow there only just comming up to 4 weeks from seed,
It is a UK Ting but easy to get it to the states dude
Good growing comunity