I'm having a problem w/ my giant hair grass! Its turning brown, black from the tips, gradually the whole leaf rots away. It is a new plant and maybe its going from emerse culture to submerse form? I saw on another post that someone mentioned trimming the hair grass short and letting it grow back that way. Do you do this w/ tall hair grasses or just short varieties? It has put out a couple plant runners in just a week. (2-3) The main plant leaves are 15" tall. I want a large grouping of this plant and if I have to trim it down it will be awhile before I get the look I want. ( but it dosn't look very good now anyway) Any suggestions? I've attached the best pic of it I could get.