ch_client = “Donald0418″; ch_width = 300; ch_height = 250; ch_type = “mpu”; ch_sid = “Chitika Premium”; ch_backfill = 1; koi fish pond. how rto clean?

does anyone know how i can clean a koi fish pond that hass like 18 fish in it. and is full of algae the algae is sticking to [...]