I just bought a 130G FOWLR that has been setup for several years, it has been up and running in my house for only several days. We saved almost all the water during the move. I know the fish are stressed but would like to do a 40-50% water change pretty soon. Is this too much for the fish right now? All the water parameters are good (dont have chart at work for specifics) but the water has not been changed for about a month. Instead of doing the typical 20% change I thought I would make my first a pretty decent size change. Any and all thoughts would be great.