My new girl wendy is acting a bit odd, she hasnt eaten for 2 days now and is sitting on a leaf at the top of the tank. She does swim around and move around but mostly stays on the leaf. Ammonia 0, Nitrites 0, Nitrates <5, I do 20% water changes every saturday, could it have been the water change that upset her? Edit: thought I would add that Fry, Randy and casper are all acting normal. she hasnt got any signs of a bloated belly or anything either.