I have baby common goldfish in my 29 gallon right now.

BEFORE YOU EVEN THINK ABOUT IT

, this is onlt temporary. I am being given a 90 gallon soon for free from the local fish store for helping out these past few months. Anyway, I made a rock formation leading to the top of the tank and inside that, put the lucky bamboo in that. the fish cannot get in and the water still flows in there. It was a good thing that I am an Architect, it is a very difficult idea to take pebbles and make a tower to hold the plant.
Anyway, I was wondering if there was any special treatment that I need to give the plant? It's roots and lowere stem are the only parts in the water. It has already been QT'ed for a month. All hater comments about the plant will be ignored.
PS: Using the same process, do you think that it would be possible to do the same with Bermuda Grass? It has grown from seed in my room for nearly a year now. (Cannot grow anything but grass!!!)