I just got some hairgrass and how much light do they need and do they need any kind of ferts or special soil or anything like that? I got a 10 gallon tank and its got 15 watts on it and im going to be adding a fert thats called theBullet. So its in a 10 gallon tank thats got 15 watts on it and going to be adding ferts in a few days and dos it need anything els? Thanks!