Its not odd at all I think. May be he wants to do an emersed scape later. Dwarf hairgrass, Eleocharis parvula is a very easy plant when grown emersed. Plant it in nutrient rich soil, or preferably Amazonia, cover the container with something see-through and spray it with water daily. Airate the container by removeing the cover onece-twice a day for 15 mins or so. If you put it outside lighting is solved, grown inside I'd advise you to give it a few watts of 6500K power compact. After a few weeks you can remove the cover as the plant will aclimate to low humidity.