Hi I am new here and quite new to ponds I have a small garden pond I will attach some pictures been running quite well I inherited it with the house. Last year the fish had got to big to went to my dads who has a huge pond. I emptied my pond cleaned (no chemical just elbow grease) and refilled the pond and put 20 baby Jumbo Koi Fry in thinking some would not survive but have not lost any I get a lot of green weed and used to manage it with Colombo no more blankets weed but have not used it with the baby fish so I have a fair amount of weed at the moment but I looked yesterday and I have white worms in the pond as well now are these ok or do I need to treat it with something? I have attached some pictures to help