my little pond is finally getting 60 degree water most of the time. I changed the filter before the water was reaching 60 well I took out some of the bio media but still had all of the pads in place. I added a bog and added a bunch of plants too. the fish have been eating ok but they don't get all worked up and are acting bit shy about eating. I thought it was all the plants and now the splashing water as it was very quiet till I changed things. so I finally decide I better test the water. I was only going to buy the ammonia kit as everyone was out of the nitrite kits. ammonia tested 0. I finally got a full kit and nitrites read between .25 .5 should I do anything besides weekly water changes?