I set up the tank a few days ago, adjusted the water to have correct Ph and whatnot, added the fish, but now I’m thinking I want to add more live plants and maybe move some decorations around. I would wait until doing my first water change to add anything in, just so I don’t have to stick my whole arm all the way into the tank. (10 gallon). I read that you should avoid putting hands in the water so you don’t mess with ph and nitrates, nitrites, etc., so if I wait til the water level is lower during a water change, will me adding stuff/moving stuff drastically change the water? Should I take the fish out to do this?