Hey guys. I purchased an amazon sword a few weeks ago and put it in my 10 gallon and 5 gallon tanks. I have the tanks split. In my 5 gallon, it seems to be doing fine. The 10 gallon tank is having issues. I put 1 on each side of the 10 gallon. One side is growing fine but the other isnt. One of the leafs are completely brown. Come to think of it when I first bought it that particular leaf was a little brown but now the whole leaf is brown. I am enclosing a pic. What should I do?