My friend got a new tank past two weeks with 5 danios in it, kind of like me..I got addicted to fishkeeping from him:3. So he ran the tank for 2 weeks and added 5 serpae tetra, so the thing is those tetras are added and been more than 1 day but there's no sign of eating:-! . Those tetras are playing , moving , everything seems normal except eating. Their Colors have become red like normal , which got faded a little when they were bought, we tried to feed them pellets , some freeze dried worms , flakes, but they don't seem to move at the top and pick for food , and the danios r slightly overfed because of the extra food they r not eating what should we do?