Very interesting. Any chance for pictures. I am not sure what you mean by groom. Does it mean pick it?I have a 150 gal. trout tank and for a biofilter I use a 3'x8'x12" gravel bed. In the gravel grow bed I grow comfrey for the donkeys and chickens . I groom it every day and when it goes dorment I plant the cut mat after juicing wheat grass. That roots and keeps the water clean in winter. In summer the grass root mat goes to the pigs. I live in the Mohave desert with not enough green on my acre to even feed one donkey, except for my garden and orchard.